Underwater Exploration: Tools and Gear for Different Types of Diving University of Wisconsin Sea Grant
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Types of Diving

Diving is generally divided into six principal categories, each of which employs its own tools, technologies and techniques. All of these diving modes are still currently in use. They are:

Free (Breath-Hold) Diving

Diving Bells

Helmut (Hard-Hat) Diving

Scuba Diving

Saturation Diving

Diving in a Heavy-Walled Vessel

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What kind of diving is this?! Read "Diving in a Heavy-Walled Vessel."