I think a more likely scenario was that the Brits were hammered and the French were fornicating with themselves - sorry all Brits.
Noq that sounds highly probable. Helluva more probable than two subs colliding in the middle of the Atlantic as a pure accident. As a matter of fact, the probability of that is NEAR ZERO. Underwater is a three dimensional space. Atlantic is HUGE compared to the size of the boats. There is almost no chance this is just out of the blue accident.
This is fishy, and, we may never know what really happened. But it was no ‘accident’. You may have better odds of winning the lottery three times in a row.