It is a visual reference as to where the clear water is. Otherwise it is difficult to know how close to the surface the diver is.
Divers dive in the sea/water, not earth.
Gravity.
to col off
They do not dive deep enough.
Diving boards
the board
People who dive are usually just referred to as divers. You can break them up into roughly four categories:Skin divers - who hold their breath, and do not use scuba equipment. Also sometimes called free divers.Sport divers - who dive for fun (they used to be called 'recreational divers', but now this term is used to distinguish sport divers from 'technical divers' who also dive for fun, but dive outside of WRSTC 'recreational' limits).Commercial divers - who dive for their jobs. By convention, this excludes recreational diving instructors, to differentiate from commercial divers who use equipment underwater, engage in saturation diving and use of elaborate gas mixes.Military divers - who form a sub-set of the navy.Not all divers fit neatly into these categories (police divers, rescue divers, fisherman who dive for their catch), but those tend to be the broad categories used.
Sea turtles are good divers because their fins help them dive into the water and help them move all around strong waters.
Dive knives can be purchased from a number of websites. Examples include Knife Depot, Scuba, Leisure Pro, Divers Supply, Divers Direct and Divers Warehouse.
Skin divers are people who dive into the ocean without using special equipment, unlike Scuba divers.
Slowly