Divers from the West Norfolk Sub Aqua Club took part in a sponsored navigation dive to raise funds for the Cromer lifeboat station.
The sponsored dive took place at Gildenburgh Waters, near Peterborugh, and raised almost �800 for the lifeboat station which once rescued one of the club's boats after it suffered engine failure.
Club chairman Dave Clack said: 'We are always looking to raise awareness and also fundraise to support the work of the RNLI, without whom enjoyment of the areas off our shores would be significantly more dangerous.'
The club is based at St James' swimming pool in King's Lynn and members regularly take their two dives boats off the North Norfolk coast.
Last month club members presented a cheque to Richard Lees, operational manger of the Cromer lifeboat station, who thanked the club for their efforts.
He added: 'Without such public support the charity would not be in a position to offer the degree of assistance to the many and varied seafarers that use or pass through the waters off our coastline.
'This support is invaluable in keeping stations like Cromer open, and able to offer 24/7 support to those in need.'
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