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The original was posted on /r/todayilearned by /u/Electronic_Cause_796 on 2026-08-18 15:53:09+00:00.

Original Title: TIL that in 2009, France’s nuclear-armed SSBN Le Triomphant collided underwater with Britain’s HMS Vanguard in the Atlantic. France initially reported that Triomphant had hit an “immersed object (probably a container)” only later discovering it was another nuclear submarine.