GLOS Glossary 107
Glossary
T
Technical Diving: A mode of diving using advanced
techniques, equipment, and training. “Technical
dives” include planned decompression dives,
deep dives where both nitrogen and oxygen in the
breathing gas are diluted with helium (trimix), dives
in which the diver changes gas mixes during the dive,
dives that use an oxygen percentage greater than 40%,
or dives into overhead environments such as caves
or wrecks. The term is also applied to diving with a
rebreather.
Total Nitrogen Time (TNT): The sum of residual
nitrogen time from previous dives and the dive time
for the present dive.
Trimix: A breathing mixture of three gases: oxygen,
helium, and nitrogen.