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Just because it is easier. It's hard to stand up in fins (FLIPPERS) on a rocking boat!!
In the Water....
swallow water
water proof ones
People are dumping trash in water.
They do not dive deep enough.
Generally no. They need to be quite fit to be able to swim in the water :)
Open Water
Divers fall backwards from a boat because it is often the easiest way to make a deep water entry from a small boat or rib.
Most scuba divers just obtain open water certifications from recreational diver training agencies, such as PADI, NAUI, BSAC or SDI.Only military or commercial divers undertake vocational diving qualifications.
I would call it the Great White Pucker Factor.
The deeper the diver goes, the higher the pressure is.