According to the site, it is a positively buoyant, self-righting hull design which it cannot capsize on itself plus it comes in single and dual mate setups with GPS, a periscope, and a full stereo system with iPod connectivity. Fully collapsible nose in case of frontal impact and tear away wings in case of side collisions. Shit is pretty well designed and is actually cheap. Only a $1500 deposit is required to start the build of one for yourself!!