Main Page | See live article | Alphabetical index Subaquatics refers to a range of sports activities that take place under water, as the name suggests. These include snorkeling, free diving, scuba diving and tech diving. Table of contents 1 Snorkeling 2 Free Diving 3 Scuba Diving 4 Tech Diving Snorkeling Snorkeling refers to swimming at the surface with face submerged while breathing through a thin tube or snorkel, as well as to diving to shallow depths -say, up to 20 meters/60 feet- from a snorkeling position while holding one's breath. Free Diving Free diving refers to a range of styles whereby well-trained snorkelers and divers try to attain a maximum depth in a single dive using only the air in their lungs from a single breath. Depths of more than 100 meters/300 feet have been attained. Scuba Diving Scuba-diving refers to longer continuous dives -say, up to an hour- to fairly great depths -say, up to 50 meters/150 feet- using SCUBA or Self-Contained Underwater Breathing Apparatus equipment. In this case, tanks containing compressed *air*. Scuba divers are mostly recreational divers. Tech Diving Finally, technical divers also use scuba apparatus, but in this case the tanks are filled with gas mixtures other than air. NITROX (nitrogen & oxygen) and TRIMIX (nitrogen, oxygen and helium) are commonly used. Tech divers make really deep dives and use gas mixtures for safety or longer bottom-time. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.