Depth
[nb 1] Comments
40 feet (12 m) Recreational diving limit for divers aged under 12 years old and beginner divers.
60 feet (18 m) Recreational diving limit for divers with Open Water certification but without greater training and experience.
100 feet (30 m) Recommended recreational diving limit for divers.
[1] Average depth at which
nitrogen narcosis symptoms begin to appear in adults.
130 feet (40 m) Absolute recreational diving limit for divers specified by
Recreational Scuba Training Council (RSTC).
[1] Maximum depth reachable by a French level 2 diver accompanied by an instructor (level 4 diver), breathing air.
180 feet (55 m) Technical diving limit for "extended range" dives breathing air to a maximum
ppO2 of 1.4
ATA.
200 feet (60 m) Maximum depth reachable by a French level 3 diver accompanied by another level 3 diver, breathing air.
218 feet (66 m) Depth at which compressed air results in an unacceptable risk of
oxygen toxicity.
[nb 2]
330 feet (100 m) Technical diving training limit for divers breathing
trimix. Recommended technical diving limit.
385 feet (117 m)
Maurice Fargues was a volunteer in a programme to determine the maximum depth a scuba diver could reach with compressed air. He became the first diver to perish using scuba.
[4]
509 feet (155 m) Record depth for scuba dive on compressed air (not officially recognised).
[5]
660 feet (200 m) Absolute limit for surface light penetration sufficient for
plant growth, though minimal visibility possible farther down.
[nb 3]
1,083 feet (330 m) World record for deepest dive on SCUBA.
[nb 4]
2,000 feet (610 m) Navy diver in
Atmospheric Diving System (ADS) suit .
[6]