A shallow dive is usually between 30 to 40 feet. Diving this shallow has many benefits such as increased visibility and dive time is limited only by air consumption. On a deep dive your bottom time is limited because of nitrogen absorption, additionally, air consumption increases at depth because of ambient pressure.
An Open Water Diver is certified to dive to 60 feet / 18 meters and an Advanced Open Water diver is certified to dive to 100 feet / 30 meters. As part of the Advanced Open Water course a student must complete a deep dive to 100 feet / 30 meters, so for an Advanced Open Water Diver, any depth greater than 60 feet / 18 meters is considered deep. Usually, a deep dive is considered to be a dive between 100 feet / 30 meters.
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