Ceiling (Decompression)
Definition
In scuba diving, a decompression ceiling is the shallowest depth a diver can safely ascend to without exceeding tissue saturation limits.
More on Ceiling (Decompression)
A decompression ceiling represents a virtual barrier created when a diver exceeds no-decompression limits. At this point, the body has absorbed enough inert gas (usually nitrogen or helium) that a controlled, staged ascent is required to allow safe off-gassing. Ceilings are calculated by dive computers or decompression tables using models like Bühlmann or VPM. Violating the ceiling by ascending too shallow or surfacing prematurely increases the risk of decompression sickness (DCS), which can lead to joint pain, paralysis, or worse. Proper ascent rates and stops are essential.
Frequently Asked Questions
It occurs when inert gas loading exceeds safe no-decompression limits. The body needs time at specific depths to safely release absorbed gas and avoid bubble formation.
Yes. Ascending past your ceiling without completing required stops can lead to decompression sickness. Always follow your dive computer’s instructions.
Dive computers use decompression algorithms to model gas uptake and release. They show ceilings and stop depths in real-time based on depth, time, and gas mix.
A safety stop is precautionary, done around 5 meters for 3 minutes. A ceiling is mandatory during decompression dives and based on gas saturation.
Yes. As the diver off-gasses, the ceiling will rise, allowing shallower ascent over time. Staying within limits ensures safety.