Ability to fill independent ballast tanks and fine regulation of the dive planes.
Ability to choose when I want to use diesels or electric engines.
A realistic damage control, because the current repair stuff to the light speed.
A watch officer and company awaken, because the current is blind, deaf and may be in drugs and drunk.
The possibility to finish my 1945's patrol in some Argentinian harbour. Somebody should be there to hand over my boot.
Traffic in the South Atlantic too.
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