I have always been interested in U Boats, how they work and there roll in warfare. This was an interesting book, could have gone into more detail on how they work, but showed how they were used in the last war, there development and limitations. A bit on the short side, I read it in a day, I am looking for another now, how long does it take to pump the air out of the tanks to make it dive? How do they pump the water out to make it surface, do they use compressed air? Can they send a radio signal while under water?
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