Topic summary
Mid-water
Extracted from the Wikipedia article List of diving environments by type.
Open water is unrestricted water such as a sea, lake or flooded quarry, where the diver has unobstructed direct vertical access to the surface of the water in contact with the atmosphere. Open-water diving implies that if a problem arises, the diver can directly ascend vertically to the atmosphere to breathe air. Wall diving is done along a near vertical face. Blue-water diving is done in mid-water where the bottom is out of sight of the diver and there may be no fixed visual reference. Black-water diving is mid-water diving at night, particularly on a moonless night.