Reverting the revert 

I do not know about any French documentary ....
But on Belgian TV we had a 'National Geographic' documentary about the Kursk (Alas! I did not record it)
It's summary is as follows:

The Kursk was taking part in an exercise with the aim of showing the power of Russia's superfast 'Skhval' torpedoes to the Chinese.
The U.S.-Navy, not happy with the planned sale of Skhvals to China, had sent two submarines to spy on 'Kursk' and thus show U.S. discontent.
One of them (Forgot which-one) had a collision with Kursk.
As a reaction Kursk opened it's Skhval-equipped torpedo-tubes.
Knowing they had no defense against a Skhval the commander of the other U.S.-sub, in order to 'out-speed' a Russion attack ordered the firing of it's own MK.48-torpedoes.
One of them sunk Kursk.
Captain of U.S-sub hurtled away and called White House as soon as possible.
Pres. Clinton grabbed 'Red Phone'to call pres. Putin in order to prevent world war III.
Putin axcepted Clinton's explanation