LYME Regis lifeboat crew and coastguards were called out on Sunday morning, following reports that a person had been swept off the Cobb wall.
Coastguards received a 999 call at 11.40am saying that a person had been swamped by a wave on the high wall at the Cobb and been swept into the sea.
The volunteer lifeboat crew were carrying out a training exercise in the area when the call was received. A thorough search of the immediate sea area was undertaken, as well as on the Cobb, rock armour and beaches.
With nothing found, crews were stood down. Eyewitnesses reported seeing a man jump from the wall and leave the area.
The incident is being considered a false alarm with good intent.
Coastguards commented: “We would like to thank the first informant for calling the coastguard having seen the ‘casualty’ swamped and then disappearing from view. It was the right thing to do.”
The Cobb was being struck by large waves at the time of the incident, which comes just a week after the lifeboat crew warned people not to walk along the high wall of the Cobb in stormy conditions.
After several people were seen on the high wall during the recent Storm Dennis, Lyme Regis lifeboat operations manager Nick Marks said: “It would be very easy for someone to be blown off the wall or swept into the sea with potentially fatal results.”