In a first, an American woman used a suicide pod to take her own life. The process took place in Switzerland. It’s done by pumping in only nitrogen gas, so the person will lose goes dizzy, loses consciousness and eventually dies. Enter futurama memes.
I believe freezing to death is considered one of the better ways to go, actually. My understanding is that hypothermia is painful to start but then you are numb and out of it as it progresses.