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Um... forgive me if I'm wrong... but it doesn't say where in the Atlantic it happened. Is it so odd if they ran into each other near the Straights of Gibraltar? Yeah it's a big ocean... but they have intersections.
Aside from that, subs travel with a certain level of buffer between them and the ocean floor. In addition, they like to find trenches and valleys which further mask their signal. Saying it's 1:1k chance is like saying aircraft colliding is equal chance in trans-ocean flight as hovering over an airfield. There are certain areas of high-traffic which increase likelihood.
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"Smite the rocks with the rod of knowledge, and fountains of unstinted wealth will gush forth." - Ashbel Smith as he laid the first cornerstone of the University of Texas
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