What minimum depth defines saturation diving?

Saturation diving is defined by the conditions under which divers operate at significant depths, where they are exposed to high pressures for extended periods. The correct definition specifies that saturation diving generally begins at depths greater than 150 feet. At these depths, the physiological effects of gas absorption become substantial, and divers can no longer off-gas nitrogen effectively during surface intervals. To manage these effects, saturation divers live in a pressurized environment, allowing them to dive multiple times without the need for lengthy decompression after each dive. This technique optimizes time spent at depth and reduces the risks associated with nitrogen narcosis and decompression sickness.

In contrast, other depth ranges mentioned do not align with the established definitions of saturation diving. Depths shallower than 130 feet typically fall under other diving practices where traditional decompression procedures apply rather than the specific operational protocols of saturation diving.