Event Brief
NATO nuclear submarines collide in Atlantic at low speed
By The BriefBrief · Sources (1)
Filed: Aug 28, 2026 at 5:02 PM ET
Summary: A British Vanguard-class and a French Le Triomphant-class ballistic missile submarine collided in the Atlantic on the night of February 3, 2009, while conducting routine patrols. Both were moving slowly, and no injuries were reported. The article says neither crew knew the other boat was there.
WHO: British Royal Navy HMS Vanguard and French Le Triomphant-class ballistic missile submarines
WHAT: A British and a French NATO nuclear ballistic missile submarine collided during routine patrols in the Atlantic.
WHEN: Feb 03, 2009
WHERE: Atlantic Ocean
WHY: The submarines were conducting routine patrols and collided at low speed; the crews did not know the other boat was there.
ℹ️ This event is analyzed using pattern arcs, velocity indicators, and source analysis in our MI Console.
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