Dan is correct. The American subs had air conditioning. This help in reducing condensation but also was great for storing food. Just like todays refrigerators. In the galley, below deck is a large storage area that was kept cool. So meats, eggs, milk, etc would stay fresh for a long time. Sometime they resorted to powdered milk after the fresh stores were used. Water was made onboard but this was mostly used for the batteries and drinking. Onc could shower or do laundry but that did not happen often.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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