Ghosting is a term for getting into the core of the platform without getting detected.

To succesfully arrive to the core without the intercept of an defender. You must not kill any guards or destroy any security devices. That goes for. UAVs, Cameras, Antitheft Devices, Decoys, Mines & Power Generators. (You can turn them off manually & the guards won't investigate shut down power generators on FOBs. This does not count as security sabotage.)

(Also you must not pick up mines as it will count as messing with security devices. I'll explain more about getting past mines later.)

You must not fulton anything. You can take out the security team with non-lethal weapons.
And lastly, don't get detected.

• Correct Camo for FOBs is squares. Guards will be able to spot you at or below 9m while crouch walking.
• UAVs can spot you at or under 10m & standing still while prone will make them go away.
• Climbing ladder while guard is in suspicion mode will get you instantly spotted. So climb down.
• If a camera spots a neutralized guard. It's vision cone is extended abit. And it will instantly spot you.
• If enemy guards go into alert status, They will start patrolling the sneaky routes to core.
• Triggering anti-theft/Lazer device will instantly move enemy CP to alert status & send guards after that device location. They will also send guards from deck ahead and behind you. Interrupting radio chatter between guard and CP will do the same. (Unless you eliminated all guards on platform.)
• Triggering an explosion will make all guards/snipers have instant spotting abilities until they've finished chatting with CP.
  
• If a guard you've been attempting to snipe starts running. He's headed towards your location, Relocate or neutralize him.
• If you're on Sniper platform,happen to have neutralized someone on your way trough the base. If you hear radio chatter. That says:CP something's going on here. Immidieatly start neutralizing all snipers that have line of sight on you. (If camera spots guard on 1st deck) CP calls it in on guard to check it out. If you're in 3rd deck it's likely guard will just say nothing's there.)
• If you distract 2 guards at once it's likely they will both investigate. Your best chance to slip by is when they're about to initiate their search. (Also stops guard from telling CP that he'll investigate.)
• If you neutralize all guards rendered rendered by fox engine. Triggering explosion might not alert guards from other platform assuming you are crowded near them, Still there's allways a chance.
  
  Basic Ghosting Loadout.
  First of for getting trough bridgeblocks and getting rid of guards/snipers, your first 3 primaries will be. AM MRS-73 NL,SLEEP GRENADE & ENERGY WALL/CARDBOARD BOX. Secondary BURKOV TB/AM A114 RP. For dealing with guards and saving your sniper ammo. Note:WU.S +SB for non-lethal. MAGAZINE is for distracting guards and making then change routes faster. SMOKE GRENADES useful against lethal guards/security devices. Everything else is pretty much last resort. You'll need 2 rank 3 suppressor and one rank 2 for shotgun.
  It's explained The Armory.
  
  Fox engine on FOBs.
  On FOBs, Only 12 guards can be rendered at a time. 8 at close and 4 on the other platform or whatever you zoom at on range. That's why guard can be called to investigate other platform. And can teleport next to you if all guards around you are in close proximity. You won't be able to see guards from other platform if you have 11 or more guards in one platform. It's a funny system that references loading screens & knocking out a guard and heading into next segment, But it's kinda broken.

Allways start on spawnpoint with stairs on FOB.
The one on the right. With huge balcony is stairs entrance. You should begin by running upstairs as soon as you spawn, Then dash on main floor. Quickly look around you and avoid/dispatch any guards that are in your way. Procced trough to the bridge and avoid triggering any anti theft devices nearby, If you see a guard on a platform next to bridgeblock, Throw a mag on left side away from you and as soon as magazine hits the ground dash trough the bridge. If the guard looks at you suspiciously, When he goes to climb down when he turns your back quickly dash trough bridge. Always avoid taking route near cranes. Dash by infront of AA placements. (Carefull they can be mined sometimes).

This will be the route you will take most of your time, Allways stick to outer ring of the area. Allways use throwing mags to distract guards away. Try to memorize certain buildings like that structure on second deck to the right. Remember that there's a camera on right side there, And it's best to sneak under the platform, preferably throw a mag to left if guard is above you. And quickly dash away. you continue this trough the third deck aswell.

Go to FOB missions. scroll to friendly FOBs category, Select your FOB and train. No resources or men will be wasted trough this excercise. So you can test out all methods in this guide. You will find out more advanced things on how to avoid certain security devices and such below.

I would highly sugguest you read this guide before taking on FOBs.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=646830578

When selecting a certain target. On right you will get information about their security.


As you can see there are 17 guards on 3 decks and 24 on objective platform.
This is false. There are ONLY 8 guards on first 3 decks and 12 on the last.
The rest of the numbers are a combat alert backup team.

(Keep in NOTE that On Sniper platforms. There are 4 Guards with assault rifles and 4 SNIPERS each 3 decks. 6 Guards with assault rifles and 6 SNIPERS on final deck. This goes for EVERY FOB.)

Let's take a look at the security devices.

There are as you can see 43 mines and 29 security cameras.

Let's talk about custom security placements.

These were added to trick intruders into getting spotted. It's deadly combined with Lethal-Sniper Platform. Many of these security placements were placed using game exploits, Such as bridgeblocks, etc. (We will talk about how to bypass them later.)

Keep in NOTE that an FOB without custom placements has to be atleast lvl 49 or below.
Has to have 39 mines and 29 security cameras.

(If the FOB level is above 50 & you don't appear to see any extra mines-cameras, It means the FOB owner has likely reduced the amount of security cameras and mines in settings, To fool the Intruder into thinking the FOB isn't Mined and full of traps, Be cautious.)

I'm sure you know this FOB has 4 custom placed mines. Max non custom placed mines and cameras for first 3 decks are 9 mines and 7 cameras. On last deck 12 mines and 8 cameras, This goes for EVERY Platform.

FOB Owners can upgrade their custom mine and camera placement up to 12 mines and 3 cameras. They can only place 1 custom camera & 4 mines per each deck.
Infiltration targets tab full of low levels huh? No problem.
Relationships
You'll find out in missions tab, When you enter go to random and start adding a bunch of players. Preferably ones with around 200-400 wins. After you've supported them all. Go to FOB missions & then to indirect retaliation tab. Bam you should find around lvl 78-60 targets. NOTE:If you never get indirect retaliations from any FOB you're supporting, you can simply go back to that menu and disband support. (30 max you can support.) *Also thankfully they have patched Indirect retaliations.*

This is Burkov TB. It has effective range up to 22 meters. At that range and beyond that you are granted tactical takedown on headshot. Its very effective when paired with rank 3 suppressor.


You can also choose rank 7 if you have developed it. It's got internal suppressor, The effective range is all the same. Rank 7 isn't that expensive to use, +you don't need to develop SMG suppressor for rank 4, As for sights they are better then Burkov rank 4. It's all about personal preference for this one.


This is WU.S +SB. Totally OP Handgun in non lethal platform, It's basically a substitute to Sleep granade rank 7 used on lethal platforms. You hit a non lethal platform guard anywhere on body parts, He will instantly go to sleep. Like Burkov you will unlock these guns by extracting certain specialists trough story missions. Anesthesia, Noise suppression, etc. Effective range is 34.5 Meters.


AM A114 RP. Very-Late-Game Weapon. Basically fires silent sleep gas. Allot smaller than sleep granade, Just hitting the face of armed lethal guard will do the trick. Doesn't work on non-lethal guards. It's useless at its lower rank. But at max it has allot more shots. It is Rival of WU.S +SB.

AM D114LB-9. Quite effective for destroying security devices. Beatiful piece. Wasn't gonna show this. But if you're near core and on last platform and there is a mine or camera in your way. Best way to deal with it is shoot the cameras. Tho you can use burkov on mines only. Anyways this gun isn't important, That suppresor on it is, Because you're gonna need quite a few Weapons that Unlock Rank 3 Suppressors for rifle and a handgun. Effective range 46M.
This is Rank 7 MACHT 37. to develop it you will need to develop all previous MACHT 37 ranks.
It costs :43k common metal, 4k digitalis purpurea, 1.5mil GMP, Lvl70 R&D & Lvl 80 Intel team.
As i mentioned about the suppresor above, This Gun unlocks rank 3 suppressor for your customization, So you can fit it with your handguns. Tho not a bad candidate for a lethal sidearm.
AM MRS-4R. (You will need to develop previous ones first.) :4.8K tarragon, 48.3k minor metal, Lvl76 R&D, Lvl85 Support team & 2.9Mil GMP. This unlocks customization of Rank 3 Suppressor on assault & sniper rifles. Essential for ghosting. The suppressor lasts 60 shots.


S-1000 AIR-S Rank 7. Mandatory Shotgun, It can knockout low armor guards in one shot up to 40 meters. It has effective range of 28 meters. To develop it you need. :Lvl133 Support, Lvl120 Medical team, 11.5M GMP, 595.5k common metal, 10.7k digitalis lutea. Do develop max rank one later tho. (Also if you have lower rank, you could develop S1000 Rank 5, contains medium suppressor.)
AM MRS-73 NL Rank 7. Robust & Precise, This will be your primary for dealing with bridgeblocks full of snipers. It can also be used to dispatch guards with precision. You can develop rank 4 cheaply early. You need atleast Lvl49 R&D & Medical.

MAGAZINE,The very thing you need. If you throw a magazine near a guard. He will investigate, When he does, He will return to patroling. But he will immideatly change course to second patrol position, This can help if you have to wait for guards to move, at non alert phases. And for making guards move away. When you throw a magazine to distract a guard, He won't hear your footsteps for a short time, You can use that to slip by.
SLEEP GRENADE rank 7, High usage cost, & hard to develop. Requirements are. :82Lvl R&D & 92Lvl Medical, 5.1k african peach, 1k haoma, 4MIL GMP. A must have weapon for ghosting lethal platforms with bridgeblocks. (If you run out of african peach, Infiltrate Medical for it.) This weapon can neutralize entire insertion deck. It's needed so you can later neutralize the second platform and get past a bridgeblock because guards can be in a way of your bridgeblock, Especially if it's on first deck. (Once you sleep the whole insertion platform. You will have about 2-3 minutes to snipe 4 marksmen on second platform & Bypass/Tank the bridgeblock.)
SMOKE GRENADE. Essential for getting past cameras and custom cameras that have been set up so they spot a knocked out guard, Thereby making them insta spotting camera. I'd sugguest you throw atleast 3 smoke granades, 2 On the camera and 1 on the way you want to go. Also on lethal platforms it will make guards cough which bassically renders them usseless for a decent amount of time. Higher rank smoke nades will extend that time. (Keep in mind if you spammed sleep granades, Or it's mist, Things like sleep/smoke grenades will dissipate way, way faster.
PETROL BOMB. More like backup tool, Very good for if you are on last deck and want to clear mines or cameras, Even a power generator. Tho be aware it can catch enemy guards on fire very easily. Which counts as kill. It's basically like silenced frag granade. Very effective, Will only scare guards. It destroys cameras way faster, But requires to be in range. Far more effective than shooting at it.
DECOYS. Yet aneother very effective backup weapon. It's useful at making cameras look in other directon, Keeping guards busy. Heck you can even use it as stun weapon. Just throw it on guard's feet & deploy to knock him out. Be aware you don't throw it in a way of camera. Bassically very effective backup weapon if you ran outa sleep nades.
STUN GRENADE. Aneother backup weapon. At lower ranks it will temporarily blind enemies, Like smoke grande. Tho requires enemies to be facing it. Which is why it isn't that effective. At Max rank, It can instantly Knockout the opposition. Sort of a loud rival to sleep grenade. Isn't really realiable because it's loud, And snipers don't like it loud.

C.BOX CITY. I can't recall how many countless ghostings have been saved by a cardboard box. Camera's about to spot you? Quickly get in the BOX. Camera won't spot you if you're fast enough, (That also depends on FOB owner's intel level because the higher it is, The faster cameras and UAVs will spot ya.) You can also Use the box in tight areas like R&D when a UAV's really near ya. Just stay still and it will go past you. You can also use it to tank a mine to save some energy walls.
NOCTOCYANIN. You will allways need this, At max rank you can have up to 8. They render guards trough walls. You need to know if guards can see you or not, Especially on most platforms. A must have for ghosting. (You can put a marker on rendering guards behind walls.)
ENERGY WALL. The ultimatum in high level FOBs. This is absolutely necessary for tanking high level bridgeblocks. Aswell as certain mines that are placed on places where you can't access the cardboard box. This allowed ghosters to get past almost impossible places to get past. NVG These are just for if you get mist or are away from marking drones/sniping guards. Just a backup tool.
SQUARE. Camo is an correct uniform for FOBs. You will allways be using it. Or any cosmetic ones from FOB events. Guards can only spot you up to 9m when crouched and prone. And yes you can just crouch jog past them beyond that range. Pretty realistic... Sneaking suits aren't effective. They just merely have defense and health Regen up for PVP.

Types of guards.
Lethal. This type is valnurable to SLEEP and SMOKE grenades. Their whole body is largely protected from Tranq weapons, Tho they are valnurable to STN. They have valnurability spot on face and nightvision. Making them harder to eliminate with non lethal weapons. They are most popular selection of security. But can be easy to deal with using the right tools. Recommended equipment.

• Burkov TB or AM A114 RP.
  
• S1000 AIR-S or hip weapon with underbarrel tranq.
  
• AM MRS-73 NL preferably with longest barrel, Whatever suits you. I go with SVG barrel and 3x scope. (Because you will always neutralize at or below 100 meters.
  
• SLEEP or SMOKE grenades. Sleep can neutralize entire platform. Whole smoke can temporarily keep target busy.
  Non-Lethal. These guards are only valnurable to STN & Tranq weapons. Their whole body isn't protected from tranq's, Expect the back of the head & helmet. However if FOB owner has developed anti-tranq. Guards will be more resistant to tranqs. Unless you have WU.S +SB. They will reduce neutralization time, Meaning they will wake up faster. (Same goes for lethal.) Reccomended equipment.
  • WU.S +SB.
  • S1000-AIR S.
  • AM MRS-73 NL.
  • STUN grenades. Not really reccomended, But if you're outa ammo & near core this will be good neutralizer/distraction.
  
  Snipers. The infamous long range setting everyone uses. I won't cover other settings because they have only defensive capabilities.
  
  • They will allways guard on elevated structures. Like cranes, towers, AA emplacements, tube structures & any structure with ladder or stairs.
  • When alert status is raised they will patrol between vantage points on structures and can insta spot you while crouched & aiming.
  • If you see one walking on ground level. Or running. He's less likely to insta spot you if you are prone during alert,Also if you try to get away from one on ground while he's getting suspicious at you,
    At a certain range he will switch to sniper mode.
  
  Sniper mode.
  See these 2 poses? That's a sniper mode. I'd suggest shooting them in face with tranq sniper. Preferably their chin and NVGs.
  When you trigger an explosion. Every guard that is rendered within you will move to cover. And aim towards the blast location. If you attempt to tranq a guard at this point and hit him anywhere but the spot you wanted to hit. He will aim towards you. If it's a soldier with assault rifle. He will relocate back to cover. If it's sniper. You better land that first shoot or you're screwed. Because when anything explodes. Sniper mode engages that will aim in direction of blast. At this point you have to wait till the guards have returned to normal sniper mode. Preferably after CP getts sitrep.
  Otherwise you can slip past if they're not in the line of your sight.
  
  Types of devices.
  Anti-Theft Device At max level these are deadly. You can trigger one by getting near it's sensor range. At that point all guards will enter alert mode. And depending on your situation guards from next and any you haven't neutralized behind will head to that device location. Therefore screwing your rendering by crowding deck. Which means you won't be able to see snipers and guards won't render from next platform. Therefore complicating your ghosting. However... (You can use it on first deck you arrive at. Guards won't arrive, It also depends on guard rank. I just use it to make second deck enter sniper mode. It's easier to dispatch them this way. They change patrol routes faster.)
  Surveillance Camera Can spot you up to 20 meters. Staying in its sight for 3 seconds will get you spotted. It also depends on FOB owner's intel team level, Higher level decreases detection time. You can use the cardboard box to make it drop suspicion on you. You can also use smoke grenades to block it's line of sight. However it's sometimes buggy and won't conceal you from camera. so it's better to drop 2 smoke nades at camera and 1 at direction you wanna go.
  UA-Drone At higher grades it has Electronics jammer. As far as i know grade 10 lethal has jammer range of 75 meters.
  It can instantly spot you when you are 10 meters or below. If you stay still proned the drone will drop suspicion at you. Has max spotting range of 20 meters. If an UA spots a neutralized guard. You can shoot it once after radio calls in, It will resume normal patrol until it spots aneother neutralized guard. if you shoot it at 21 meters or beyond. It won't spot you. Make sure to stay proned. (You can also slip by using that dash method if you're fast enough, Same goes for camera.)
  IR-Sensor. This sensor is usually placed on lower decks. It works exactly like motion sensor. You can get past it by using ledge. But you can use it to your advantage of your fast enough to trigger it and bait guards downstairs.
  
  
  
  
  

So you're familiar with all the equipment and methods.
When ghosting high level FOB. You should account for these things.

• After you naturalize first platform quickly. You have 2 minutes or less To neutralize all 4 snipers on next platform/those in line of your sight with sniper rifle. And get past bridgeblock by tanking it.
  
• It's vital that you absolve the bridgeblock as quick as possible. Before taking anyone out you could check if bridgeblock has 2 mines & 1 camera at lower tunel of it. Not reccomended tho. Might waste time. But might find a way in without triggering mine.
  
• You repeat this process while moving rapidly trough platforms. If the defender has placed mines on first and second deck. That's flawed. Especialy if he has placed them all on one bridge. Which will be easy to bypass. That means you get a free walk to his core to deal with last bridgeblock. This if he placed 2 bridgeblocks on first 2 decks and 1 on last.
  
• Sometimes defender will place first 3 bridgeblocks on first 3 decks. This is also bad. Especially on R&D, because once i get past your 3 bridgeblocks. I can just walk to core easily.
  
• If you see that defender has placed bridgeblocks on second third and final deck. You're gonna have to likely eliminate first and second deck. But sometimes defender will place bridgeblock on second bridge. That means you have to only eliminate second and third deck & Most likely fourth's snipers aswell. (Depends on platform you're raiding).
• Allways scout out in the Idroid menu before commencing infiltration, Mines and cameras on each deck. Also choose FOB platform with decks your familiar with. That way you can eliminate the snipers as fast as possible.
• If you have eliminated 2 or 3 snipers, And don't have line of sight of the last one. Don't hesitate just go and tank the bridgeblock, You're on a timer & guards can wake up pretty fast on high levels. Make sure to shoot the wall or structure near them to make them face your way. So you can tranq them..
• Allways watchout for mines & cameras when sneaking trough a deck. Count custom mines and camera on deck. So you can allways know if he wasted his last on this deck.

The lowest staff rank you deploy with the higher staff rewards you get. Max is 2.00 while strongest can go up to 0.70. However that 2.00 is unlikely to survive 3 shots by guard, Or a lethal mine, Even a fall.
so sometimes its best to find 1.70 or any rank that can survive mines. If you're going for resources, It's best to pick for 1.00 rank like snake.

This is the most modern one of all. The knack about this one is domino effect to destroy the camera so defender can arrive. However you can counter it by triggering a mine on farther right. By just using cardboard box or vaulting it with energy wall so you don't get knocked of and you just end up traversing behind the ledge without getting knocked out. Also approach the one on far right when camera is facing away. They can also place same thing on the end of the bridge. Other end. But you can easily fix this by just walking to right side again with energy shield or cardboard until you tank it. Then vault the bridge cliff and traverse behind the bridgeblock.
Avoid these, Just tank the upper one. However i sometimes can get trough bridgeblock by running/jumping into a mine but you need energy wall, You just spring while sticking abit to left, Not far enough to trigger a mine on left. But still enough. However this is still unconfirmed if it's effective or not. So just stick to top bridge tanking.

Command platform. If Lethal use sleep grenades, To neutralize the rest of the platform. If non lethal. Grab a WU.+SB.
It's cruical that you eliminate them as quickly as possible. You will take the right route towards the spiral stairs. Tank the mine and watchout for drones above. Let them pass. Then be carefull when climbing ladder to power generator they can still easily spot you when on ladder. Just make sure they aren't looking at ya. Tank all the mines on small bridge using energy wall. Disable power generator and proceed carefully upstairs. While still avoiding drones, And watchout for mines. You could also take the left route with lots of stairs. But be sure to molotov the power generator. You have about 40 seconds to reach the core. Use energy wall and speedrun it. You could also throw and use decoys to make cameras look away. Just be carefull, They are most trickiest to dodge when they're yellow.
This one is sniping oriented. Just snipe all the guards. Or if you get close up sleep grenades. Speed things up. Watch out for that one sniper watching lower deck gate on right. Just tranq him aswell. Then proceed behind the platform. Watchout for camera. And sleep granade any nearby guards. Wait for the camera to look away while you sneak to power generator and shut it off. prepare stun shotgun and energy walls as you traverse upstairs and shoot any guards that you haven't taken down.
You won't need to take down most guards on this one it has most simplest route. There are 3 entrances. One is near crane, The Other near boxes. You're looking at the one near the blue miniature lifter. Watchout for any custom mines and cameras at the entrance, Above it, Behind one of the air ducts, Go and shut down the power generator, Watchout for any guards that are left or right, If so distract them with a mag. now either take the stairs or airduct, The one that isn't mined. When upstairs if there are any guards nearby on your floor, Dispatch them silently. Proceed up the right airduct, If there is a mine, Activate Energy wall and trigger it by going up, You will likely get knocked down, If so get up again and proceed to do same for left and right, And also be aware, There are guards that patrol 2 atleast, The second floor, Just make sure they aren't nearby, Use sleep grenades or tranq them if needed. Start climbing up, again. Also if you see a guard on one small terace just about above you, Dispatch him. Also watchout for any snipers on north roof side, They can also spot you there, When you reach the third floor/roof,immideatly equip cardboard box if you hear nearby drone, Also do the same thing if there's a mine on third floor. It's important if you menage to neutralize a guard to interrogate him about camera, Then find aneother one and interrogate him on drone positions. Helps alot. You can either traverse trough the balcony, Or terrace behind you. Well terrace is kinda better. assuming either of them aren't mined. You can also throw sleep granades from terrace/balcony to sleep nearby guards on roof. Helps quite allot. Especially if you need to trigger a mine on roof stairs. or terrace.
This one has specific tactic, And its ussually the safest strategy you can go with. Snipe guards on crane & platform with 4 containers, Leave ones on core floor, Mark all drones first tho. Snipe that 1 guard on base dev platform roof balcony. He can stay down. Also use tranq rifle to snipe in direction away from you near guards, Because they can spot you. Move behind the containers, Into under section of base dev platform core, Snipe that guard camping at ledge over gates, You have likely triggered antitheft device by going in behind the containers, So after you quckly snipe that guard, Go right to power button and shut off electricity, After you triggered anti theft device it's likely 2 snipers have rushed below to investigate. So you can either take them out, Or move along the stairs below the base dev, at top floor, If sniper is still there waiting on edge, Just kick him down with stunshotgun. There might be still aneother guard near core door. So just watchout for drones at all times and you should make it.
This one is the simplest of all. Just go behind the platform with open gates & 1 platform with aa enplacement. There will be ussually 4 guards, 2 on the platform and 2 around it, Use sleep granades, or a tranq sniper, First distract them with short towards you, It disables their insta spotting abilities for short time, so hurry and take the shots. also throw sleep grenades at stairs ahead, Near crane. Will take down any incoming guards from lower floor. Also make sure to stun shotgun anyone facing you in warehouse area. Or tranq. Activate energy wall as you dash down stairs and quickly get past trough the lower floor. Watchout for camera and get past it. Watchout for mines aswell as any guards & use stun shotgun on them. And you'll be fine.
You might not believe it but this one is easiest to infiltrate. You just need to be very specific in execution. Snipe all guards outside, When you get close enough finish it with sleep nades. Assuming stairs are blocked by mines, Use airvent when you sleep everyone, If airvents are both mined, Well atleast you know he wasted 4 custom mines, Tank routes that aren't exposed to platform facing them. Now if intel building is mined. Most custom mines placed are on stairs leading to core sometimes on shortcut aswell & on core door entrance. You have 2 entry points 1 is guarded by sniper, but you can take him out easily. The other one is guarded by survailance cameras, And guard that sometimes will patrol near it. The best strategy here will be to let the guards come investigate bodies outside, Makes intel less crowded. The route that leads to open antenna cover is more reccomended and easier. Not to mention that sniper can mostly circle around the ball. So it's better if you eliminate him. It's far better to bait the guards down stairs with a mag or shooting at guard with stn weapon.climb up the green crates, And dash to left to avoid camera, Go beneath it, Tank that mine, Shutdown the power generator. As for other route. Watchout for any approaching guards, When camera on right wall looks away to right climb the tool cabinet and stick to left so that camera near generator doesn't see you. When it looks away shutdown the generator quickly. After that climb the airvent near that camera at entrance, the drone won't spot you as long as you stick to that side. It will patrol from left to right. Second drone will patrol the stairs right and left side aswell. Time your movement. head right to aneother airvent. Watchout for mines near em tho. Use cardboardbox to make drones drop suspicion on you. If drone spots downed guard on stairs. you can peek and shoot it from left side to drop suspicion. prepare to energy wall stairs and use shortcut to core. Also if there are guards nearby just use stun shotgun aswell. Also if there are guards on core floor use sleep granade to sleep them, Or you could use smoke to scare them away from stairs so you can march in without getting instantly spotted & shotgun them.
This one is abit tricky. Your safest strategy is tranqing all snipers that are near your entrance. And sleep nading 2 buildings away from core door. And one near power generator. It's best to leave

Door corridor untouched because guards might be there and they + cameras/drones are bad combination. It's best if they just move away from the corridor. Then you can activate energy wall and just tank trough core door. Watchout for custom placed cameras and mines. It's just best to reach core door faster than camera spots you.