<P> Deep diving can mean something else in the commercial diving field . For instance early experiments carried out by Comex S.A. (Compagnie maritime d'expertises) using hydrox and trimix attained far greater depths than any recreational technical diving . One example being the Comex Janus IV open - sea dive to 501 metres (1,644 ft) in 1977 . The open - sea diving depth record was achieved in 1988 by a team of Comex divers who performed pipeline connection exercises at a depth of 534 metres (1,752 ft) in the Mediterranean Sea as part of the Hydra 8 programme . These divers needed to breathe special gas mixtures because they were exposed to very high ambient pressure (more than 50 times atmospheric pressure). </P> <P> An atmospheric diving suit allows very deep dives of up to 2,000 feet (610 m). These suits are capable of withstanding the pressure at great depth permitting the diver to remain at normal atmospheric pressure . This eliminates the problems associated with breathing high - pressure gases . </P> <Table> <Tr> <Th> Depth </Th> <Th> Comments </Th> </Tr> <Tr> <Td> 12 metres (39 ft) </Td> <Td> Recreational diving limit for divers aged under 12 years old and EN 14153 - 1 / ISO 24801 - 1 level 1 (Supervised Diver) standard . </Td> </Tr> <Tr> <Td> 18 metres (59 ft) </Td> <Td> Recreational diving limit for divers with PADI Open Water certification but without greater training and experience . </Td> </Tr> <Tr> <Td> 20 metres (66 ft) </Td> <Td> Recreational diving limit for EN 14153 - 2 / ISO 24801 - 2 level 2 "Autonomous Diver" standard . </Td> </Tr> <Tr> <Td> 30 metres (98 ft) </Td> <Td> Recommended recreational diving limit for PADI divers . Average depth at which nitrogen narcosis symptoms begin to be noticeable in adults . </Td> </Tr> <Tr> <Td> 40 metres (130 ft) </Td> <Td> Depth limit for divers specified by Recreational Scuba Training Council . <P> Depth limit for a French level 2 diver accompanied by an instructor (level 4 diver), breathing air . </P> </Td> </Tr> <Tr> <Td> 50 metres (160 ft) </Td> <Td> Depth limit for divers breathing air specified by the British Sub-Aqua Club and Sub-Aqua Association . </Td> </Tr> <Tr> <Td> 55 metres (180 ft) </Td> <Td> Depth at which breathing air exposes the diver to an oxygen partial pressure of 1.4 bar . </Td> </Tr> <Tr> <Td> 60 metres (200 ft) </Td> <Td> Depth limit for a group of 2 to 3 French Level 3 recreational divers, breathing air . </Td> </Tr> <Tr> <Td> 66 metres (217 ft) </Td> <Td> Depth at which breathing compressed air exposes the diver to an oxygen partial pressure of 1.6 bar . Greater depth is considered to expose the diver to an unacceptable risk of oxygen toxicity . </Td> </Tr> <Tr> <Td> 100 metres (330 ft) </Td> <Td> One of the recommended technical diving limits . Maximum depth authorised for divers who have completed Trimix Diver certification with IANTD or Advanced Trimix Diver certification with TDI . </Td> </Tr> <Tr> <Td> 120 metres (390 ft) </Td> <Td> 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 . </Td> </Tr> <Tr> <Td> 155 metres (509 ft) </Td> <Td> Record depth claimed, but not officially recognised, for scuba dive on compressed air . </Td> </Tr> <Tr> <Td> 200 metres (660 ft) </Td> <Td> Limit for surface light penetration sufficient for plant growth in clear water, though some visibility may be possible farther down . </Td> </Tr> <Tr> <Td> 332 metres (1,089 ft) </Td> <Td> World record for deepest dive on SCUBA . </Td> </Tr> <Tr> <Td> 534 metres (1,752 ft) </Td> <Td> Comex Hydra 8 experimental dives. (1988) </Td> </Tr> <Tr> <Td> 610 metres (2,000 ft) </Td> <Td> US Navy diver in Atmospheric Diving System (ADS) suit . </Td> </Tr> <Tr> <Td> 701 metres (2,300 ft) </Td> <Td> Comex Hydra X (Hydra 10) simulated dive in an onshore hyperbaric chamber by Theo Mavrostomos on 20 November 1992 . </Td> </Tr> </Table> <Tr> <Th> Depth </Th> <Th> Comments </Th> </Tr>

How deep can a human go underwater with equipment
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