Diver and organiser Jason Haiselden plans to hold the event off Swanage beach on 24 September, weather permitting. Permission to run it has been granted by Swanage Town Council.
In the process, Haiselden aims to raise money for Heroes Haven Swanage, which wants to build a holiday cabin for disabled service personnel; the Scuba Trust, which provides dive training for the disabled; and the RNLI.
Participation in the record attempt will cost £10 a head.
The attempt has the backing both of the Council and of the Swanage and Purbeck Hospitality Association, which represents many local businesses.
The Guinness record to beat is the figure of 2486 divers who descended together off Indonesia in 2009, in a stunt organised by the country’s navy.
Haiselden hopes to get as many as 3000 divers under water together for, as required by Guinness, at least one minute. Observers and a Guinness adjudicator will decide whether or not this has been achieved.
“Swanage should make a good venue for the attempt because the seabed shelves gradually, with a depth of two to three metres when you’re some 200m out,” Haiselden told Divernet.
"In addition, the eastward-facing bay is sheltered from our predominantly southerly to westerly winds.”
Apart from diving participants, people also being sought are two standby diving doctors and kayakers to act as safety stewards.
Information and registration – www.gwr.scubaclick.com
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