Below the ski resort of Verbier (Swiss) there is bunker which has been converted into a hostel. I've stayed there for a week and it is very bad, and this is just sleeping there at night. Think tiny 3 story bunks, 10+ person dorms, 2 showers and almost no communal area.

https://www.tripadvisor.com.au/Hotel_Review-g198848-d306983-...