Hospital ship

ship designated for primary function as a floating medical treatment facility

A Hospital ship is a big boat which is built to cure patients. Most are operated by militaries, or by governments. Attacking one is a war crime, but Hospital ships are not allowed to carry any weapons, and enemy navies (if the owner of the Hospital ship is at war) are allowed to inspect them. And hospital ship is due to be protected by Second Geneva Convention.

United States Navy hospital ship USNS Comfort in 2009.