What is the purpose of the angled bracket on the front top of

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What is the purpose of the angled bracket on the front top of submarines you see from World War I and World War II? - Quora

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What is the purpose of the fin-like structure above the propeller on some submarines (e.g. USS San Juan)? Does this feature serve any purpose, or is it just for aesthetics? Is this

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Was 'behind the the keel plate' of a WWII-era German submarine normally in a pressurized or submerged section of the ship? - Quora