 It also allows the divers to be relatively safely and conveniently lifted out of the water and returned to the deck or quayside.A wet bell, or open bell, is similar to a diving stage in concept, but has an air space, open to the water at the bottom in which the divers, or at least their heads, can shelter during ascent and descent.A wet bell provides more comfort and control than a stage and allows for longer time in the water.