Technical diving

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Technical diving is a form of SCUBA diving that exceeds the scope of normal, recreational diving. To dive safely, technical divers require additional training, experience and equipment.

There is no rigid definition of Technical diving. If there was it might be something like this: it is the techniques and use of diving equipment and special breathing gases to carry out dives:

to depths deeper than 130 feet / 40 meters, but typically in the 50 metre to 100 metres depth range and particularly using hypoxic breathing gas mixtures, such as Trimix, Heliox or Heliair
with significant Decompression stops and particularly using rich Nitrox mixes or pure Oxygen to reduce the duration of the stops.

Typically the technical diver uses a Rebreather or high capacity diving cylinders in a twinset configuration to provide sufficient breathing gas needed for these deeper and longer dives.

Technical dives often take place when divers go:

Cave diving - diving into a cave system.
Ice diving - diving under ice.
Wreck diving - diving inside a shipwreck.