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The original was posted on /r/todayilearned by /u/KimCureAll on 2023-07-02 11:11:05+00:00.

Original Title: TIL how trash is disposed of in modern large submarines. Trash is deposited into a Trash Disposal Unit (TDU) which collects and compacts it into a galvanized steel can. A ball valve is opened allowing the scrap iron-weighted can to fall down to the sea floor.