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Conventional submarines are not as energy-rich as nuclear submarines, and freshwater resources are relatively tight. It is said that during World War II, submarine crew members only chewed gum, and did not brush their teeth or bathe.
However, the modern submarine's tonnage is getting bigger and bigger, the situation has been improved a lot, there is enough room to set up the bathroom, and even some submarines will have a library and gym.
The Kilo-class submarine we ar ...
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