It has been suggested that when a person is in desert survival or surrounded by water and devoid of drinking water that the person must resort to drinking his own urine if it is the only liquid available. This technique has been said to extend life from one to two extra days but evidence remains sparse.
Contrary to that notion is that drinking urine may actually increase the speed of dehydration because of certain bodily toxins and salinity in the urine.
Aron Ralston claims to have used the technique when trapped for several days with his arm under a boulder.
