The turrets can be bought in the sub upgrade guy on the station, effectively doubling the output of the turrets. Due to how Barotrauma works (sometimes buggy), you might need to uninstall the turrets first, redock (or save and reload), then buy the turrets. They have to be the same type because of the loaders, so the top two should be the same, and the bottom two should be the same. Then they will be controlled by the periscope normally. If you assign an AI bot, then just pick one of the two turrets at the same spot, and they will operate it normally - just shoot twice as much, consuming more ammo and power, but killing things a lot faster.

i love this sub but could perhaps explain how the turrent situation works?? hahaha i oculd just be really dumb and im playing single player so i dont have a co-captain to slap me upside the head lol

i dont get the 4 weapon turrents situation???

wowzers