Britain and France Crash 25% of Their Nuclear Submarines Into One Another

They only have four nuclear submarines each. So how the F do they manage to crash them into each other? Who's the Admiral over there, Benny Hill?

From the NY Times.

LONDON — Two nuclear submarines, one French and the other British, collided in mid-Atlantic earlier this month, reports in the British and French news media said on Monday, quoting sources in the two defense ministries.

Britain and France each have four missile-carrying nuclear submarines, constituting the core of their nuclear arsenals. According to military journals, Le Triomphant carries 16 ballistic missiles with a range of 5,000 miles, each with six warheads. H.M.S. Vanguard is a Trident-class submarine, 492 feet long and weighing 16,000 tons. It, too, carries 16 missiles, each with three nuclear warheads.