"I don't think he did. He went INSIDE the sub and then we don't see him until he's being 'caught' red handed yet he's wet. If he blew up a sub by putting C4 inside or underneath (the only reason to be in the water to blow it) there would have been masses of BIG debris dropping down into the water and around those by the quayside. Personally I believe he went inside to see if he could figure how to use it, found out how and moved it further into the bay then swam back to the quayside and blew a section of the jette up, thus explaining why he's wet and also why the debris was minimal in light."