As i found yesterday, when i lost my Aft batteries and my Starboard Diesel, your batteries will not recharge unless the Stb diesel is firing.
I could maneuver just fine with one engine, it acted just like it was charging, but nothing was actually happening. So I was stuck decent surface speed, but only about 15-20% battery life left if I had to dive.
You could try slowly going decks awash deeper and deeper until MAYBE the Electrics kick on but you still have a deck crew. But I doubt it since it's governed by the exhaust and air intake height.
Would be nice to steam along at 10-12 kts on battery on the surface though.
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Luck is a residue of Design.
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