Heli-Skiing
Heli-skiing is the act of dropping off of a helicopter to reach areas that were previously untouched by other skiers. However, because these locations are so high up and untouched, they're usually high-probability avalanche zones. Roughly 100 skiers lose their lives because of heli-skiing every year.
Cave Diving
If you thought that scuba diving was dangerous on its own, try diving inside of a cave. The potential dangers nearly triple when entering a cave underwater. Loose sediment might clog your gear, you might run out of oxygen and be too far in to return, or, in a worst-case scenario, the cave might even collapse on you. Roughly three to eight people die from cave diving per year.