It is a very nice place. I see the episode is on the c4 player, I'll watch that tonight.
We have some photos somewhere on here of the French ship's boiler on the rocks.
Do they mention the submarine? I know it's in very shallow water and in bits. (perhaps not above the low water mark though) I've intended going up for a paddle to see if anything is visible - not got around to that yet.
edit:
Tadorne boiler