Sounds cool but... I'm fairly certain that the suspended animation he's talking about is also known as a coma.
MSDS excerpt for hydrogen sulfide:
Toxicology
Highly toxic - may be fatal if inhaled. Inhalation of a single breath at a concentration of 1000 ppm ( 0.1% ) may cause coma. Corrosive when moist. Skin contact may cause burns. There is a rapid loss of sense of smell on exposure to gas concentrations above 150 ppm, and this means that the extent of exposure may be underestimated. Perception threshold ranges from 0.5 ppt to 0.1 ppm. Irritant. Asphyxiant.
I'm guessing the concentration is toned down quite significantly because it's basically like battery acid. Much like gargling with hydrogen peroxide you can do it but you have to watch how much you use because otherwise.... you'll die. Mr. Roth is basically talking about extreme anesthesia where in order to save someone from being killed... he almost kills them first.
I can see the use for this in dire situations but no doubt will there be side effects from hydrogen sulfide what the effects are and if they are long term only time will tell. Its worth looking into.
