I just talked to W.F. Oliver, and he said the Bimare Jav 2's are required by law in Europe (as Wouter said) to have a certain amount of positive flotation. In this case, though, because of the size and location of the hole in the boat that was T-boned at the Alter Cup, the flotation was dislodged from where it was secured to the inside of the hull and it escaped through the hole.