The breathing gas supply for the open bell may be self-contained, or more usually, supplied from the surface via flexible hose, which may be combined with other hoses and cables as a bell umbilical. Internal air pressure is at the pressure of the free water surface, and varies accordingly with depth. The compartment may be large enough to fully accommodate the divers above the water, or may be smaller, and just accommodate head and shoulders. The historically older open diving chamber, known as an open diving bell or wet bell, is in effect a compartment with an open bottom that contains a gas space above a free water surface, which allows divers to breathe underwater. Further information: Diving bell ยง Structure of a typical wet bell
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