Because of its high density and extreme salt content, the Dead Sea is the easiest place in the world to stay afloat. This sea, which borders Israel, the West Bank, and Jordan, is eight times saltier than the ocean. This saltiness create a challenge to divers. In order for them to lower their buoyancy enough to dive down, divers must carry 40kg(90lb) weights. The water of the Dead Sea is dangerously salty, in fact. Divers wear full face masks because accidentally swallowing this water would cause the larynx to inflate, resulting in immediate choking and suffocation.