hah...no. No stringers in there (You usually don't see stringers with foam core construction - just an occasional sub-deck...but that's another topic). That is a leaky and loose shroud plate shown from the inside of a Nacra 20 hull. The barely visible vertical part on the right is the leading edge of the daggerboard well and the tube is a through-hull tube for the trapeze bunji. The bolts you see are bolts holding the spinnaker sheet block to the deck through a reinforcement plate in the deck. I detailed the repair I did on that last weekend on the teamseacats website and it involved pressurizing a cup of epoxy and forcing it into the hull.