I’m assuming you didn’t watch the video, but this particular helmet design has a completely open bottom. the only thing keeping the water beneath you out is the positive pressure from the air hose. Any excess air flows out the bottom.
it needs weights attached to it to keep it from floating (he attached just enough weight to keep it neutrally buoyant). If it sprung a leak, you would easily be able to remove the helmet either by lifting it up off you, or tilting forward or to the side and sliding it off. it is not strapped to the person at all.
I’m assuming you didn’t watch the video, but this particular helmet design has a completely open bottom. the only thing keeping the water beneath you out is the positive pressure from the air hose. Any excess air flows out the bottom.
it needs weights attached to it to keep it from floating (he attached just enough weight to keep it neutrally buoyant). If it sprung a leak, you would easily be able to remove the helmet either by lifting it up off you, or tilting forward or to the side and sliding it off. it is not strapped to the person at all.