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Term Explanation
END Equivalent Narcotic Depth is used as a way of
estimating the narcotic eect of a breathing gas
typically with trimix gas mixtures. For a given breathing
gas mixture and depth the END indicates the depth
which would produce the same narcotic eect when
breathing compressed air.
Floor The deepest depth during a decompression dive where
it is recommended to stop for an eective
decompression.
He% Helium percentage or helium fraction in the breathing
gas.
MOD Maximum operating depth of a breathing gas is the
depth at which the partial pressure of oxygen (pO
2
) of
the gas mix exceeds a safe limit.
Multi level dive 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.
Nitrox (Nx) In sports diving, refers to any mix with a higher fraction
of oxygen than standard air.
No deco 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.
No decompression dive Any dive which permits a direct, uninterrupted ascent to
the surface at any time.
No dec time Abbreviation for no decompression time limit.
OC Open-circuit. Scuba that exhausts all exhaled gas.
OTU Oxygen tolerance unit. Used to measure the whole-
body-toxicity, caused by prolonged exposure to high
oxygen partial pressures. The most common symptoms
are irritation in the lungs, a burning sensation in the
chest, coughing and reduction of the vital capacity.
O
2
% Oxygen percentage or oxygen fraction in the breathing
gas. Standard air has 21% oxygen.
pO
2
Partial pressure of oxygen. Limits the maximum depth to
which the gas mixture can be safely used. The
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