A flooded quarry where a man drowned on Monday was expected to reopen to divers on Tuesday.
The centre was closed while police and safety experts investigated
A man, in his 40s and from Middlesex, died at the National Diving Centre in Tidenham, Gloucestershire, six weeks after a couple died there.
He and two others got into difficulties in the 250ft deep lake.
One of them, a 46-year-old man from Buckinghamshire, was airlifted to hospital by the Coastguard for treatment in a decompression unit.
The woman, aged 38, also from Buckinghamshire, was not seriously hurt.
The centre was closed after the tragedy on Monday afternoon while police and the Health and Safety Executive carried out investigations.
Police are not treating the death as suspicious.
The centre hosted the National Freediving Championships over the weekend but a spokesman has stressed this latest death was not connected.
Janine Davison-Evans, 27, of Stockton on Tees, Cleveland, and her boyfriend Hank Austin, 25, of Ascot, Berkshire, both drowned while diving in the lake on Good Friday.