[Jimbuna]

Go into Data\CFG then gameplay settings and swap the relevent section inside for this:

[RealismPercentage]
LimitedBatteriesRealismPercentage=99
LimitedCompressedAirRealismPercentage=0
LimitedO2RealismPercentage=0
LimitedFuelRealismPercentage=0
RealisticVulnerabilityRealismPercentage=0
RealisticRepairTimeRealismPercentage=0
RealisticShipSinkingTimeRealismPercentage=0
ManualTargetingSystemRealismPercentage=0
NoMapUpdateRealismPercentage=0
RealisticSensorsRealismPercentage=0
DudTorpedoesRealismPercentage=0
RealisticReloadRealismPercentage=0
NoEventCameraRealismPercentage=0
NoExternalViewRealismPercentage=0
NoStabilizeViewRealismPercentage=0
NoNoiseMeterRealismPercentage=0
NoWeaponOfficerAssistRealismPercentage=1

Be sure to backup the CFG file first.