re: #64 darthstar

A simple non rebreather mask (used by paramedics everywhere) and a tank of inert gas will do the trick.

The problem is that a hard seal has to be made with the face. Apparently any sort of plastic facemask can open up breaks along the mask as the person fights. And beards also can prevent a hard seal. These can allow air to get in, mixing with the nitrogen and extending the death process. This is what right-to-die people have seen and warned against.