Diving bell Spalding's arrangement chamber transport divers diver ocean wet bell closed bell cable suspended moon pool
A diving bell is a rigid chamber used to transport divers to depth in the ocean. The most common types are the wet bell and the closed bell. The wet bell is a cable-suspended chamber, open at the bottom like a moon pool structure, that is lowered underwater to operate as a base or a means of transport for a small number of divers. The pressure of the water keeps the air trapped inside the bell. They were the first type of diving chamber. Unlike a submarine the diving bell is not designed to move under the control of its occupants, nor to operate independently of its tether. The closed bell is a sealed chamber, which may be used for mixed gas bounce diving and for saturation diving. This form of bell locks on and off the chamber where the divers live, by way of a closed door sealing the divers in at pressure. Once on the surface, the bell is mated with the chamber system and the space in between is pressurized to enable to divers to make a seal and transfer through to the chamber which is at the same pressure. In saturation diving the bell is merely the ride to and from the job, and the chamber is the living quarters. If the dive is relatively short (a bounce dive), decompression can be done in the bell in exactly the same way it would be done in the chamber.
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Photo credit: © SOTK2011 / Alamy / Afripics
License: Licensed
Model Released: No
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