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CEILING, CEILING ZONE, FLOOR AND DECOMPRESSI-
ON RANGE
When in decompression, it is important that you understand
the meaning of ceiling, fl oor, and decompression range (Fig.
6.14.):
The ceiling is the shallowest depth to which you
-
should ascend when in decompression. At this depth,
or below, you must perform all stops.
The ceiling zone is the optimum decompression stop
-
zone. It is the zone between the minimum ceiling and
1.8 m [6 ft] below the minimum ceiling.
The fl oor is the deepest depth at which the decom-
-
pression stop time will not increase. Decompressi-
on will start when you pass this depth during your as-
cent.
-
The decompression range is the depth range between
the ceiling and fl oor. Within this range, decompressi-
on takes place. However, it is important to remember
that the decompression will be very slow at, or close
to, the fl oor.
The depth of the ceiling and fl oor will depend on your dive
profi le. The ceiling depth will be fairly shallow when you en-
ter the decompression mode, but if you remain at depth, it will
Fig. 6.11. Decompressi-
on dive, above fl oor. Up-
ward pointing arrow has
disappeared and ASC TI-
ME label has stopped blin-
king, which means that
you are in the decompres-
sion range.
61
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