batteries recharge without fuel. i know this because well...i ran out about 2000km from base. dive run on batteries surface and they recharged. took forever at less than 20k a dive. also....being damaged kills you efficiency. i get from midway to sea of japan on roughly 1/4 tank and i had more than 1/2 a tank left on my way back when i ran out....travelling at 1/3 speed.
solar power? wind? lol
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