Technical diving (or tec diving) is a specialized form of scuba diving that extends beyond the limits of recreational diving, often involving greater depths, longer dive times, and specialized equipment and techniques. It includes diving in overhead environments like caves and wrecks, and requires extensive training, specialized gas mixtures, and meticulous planning.

​In the underwater world of scuba diving, descending to depths up to 40 meters (130 feet) is considered recreational scuba. When divers exceed this limit, they enter the realm of technical diving.

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Unlike recreational diving, technical diving requires specialized training, equipment, and procedures that allow divers to push beyond the limits of conventional diving.

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Technical diving is simply the use of advanced (technical) techniques to allow divers to use open-circuit scuba equipment and mixed gas to a depth of 300 feet. Let's start with the "gas" that we're breathing; the air that we breathe at sea level is comprised of 79% nitrogen (and other trace gases) and 21% oxygen.

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