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Meaningful Upgrades

Upgrade cost scales more linearly with what you are paying for.
More incentive to max out an upgrade category instead of buying a different sub.

Some Items can be upgraded to +50% or +100% efficiency.

The level-cap of hull strength upgrades have been increased to allow investment in late-game survivability.

Max level amounts have been increased or decreased, compressing items with un-needed
levels into fewer upgrades and expanding items which did not have enough levels into more upgrades.

Adds new unique upgrades for: Sonar Range, Turret Firerate, Discharge Coil Range, and Discharge Coil Efficiency, and Machine/Equipment base HP.

Pumps and Engines have been given very high max limits, this is to facilitate 'certain types' of submarines. Typhon2, Berillia, R-29
If you manage to max-upgrade a submarine which is 'already upgraded' it will be extremely broken. - upgrade responsibly.

*Note: All currently supported EK submarines are now handling-stat compatible with engine speed upgrades, speed increases with more upgrades should now be more linear speed increase instead of exponential.