LYME Regis lifeboat launched in rough sea conditions on Friday, October 12 to a report of a person in the water near Chesil Beach.
The volunteer crew responded to a call from the coastguard following a report of a person in difficulties.
The crew were contacted by the coastguard at 3.35pm and launched in heavy seas during Storm Callum.
Half an hour later the crew were stood down when a local coastguard response team reported it was not a person in the water.
The alarm had been raised by a member of the public and was recorded as a false alarm with good intent.