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Term Explanation
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.
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