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Term
Multi level dive
Nitrox (Nx)
No deco
No decompression dive
No dec time
OC
OTU
Explanation
A single or repetitive dive that includes
time spent at various depths and
therefore has no decompression limits
that are not determined solely by the
maximum depth reached.
In sports diving, refers to any mix with
a higher fraction of oxygen than
standard air.
No decompression stop time. The
maximum amount of time a diver may
remain at a particular depth without
having to make decompression stops
during the subsequent ascent.
Any dive which permits a direct,
uninterrupted ascent to the surface at
any time.
Abbreviation for no decompression
time limit.
Open-circuit. Scuba that exhausts all
exhaled gas.
Oxygen tolerance unit. Used to
measure the whole-body-toxicity,
caused by prolonged exposure to high
oxygen partial pressures. The most
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