A 31-year-old man has died in hospital after diving off the coast of Methil in Fife.
The alarm was raised shortly before 1430 BST by diving crew on board the Rob Roy.
The Maritime and Coastguard Agency said the unconscious man was found and pulled from the water by two divers from a nearby catamaran.
He was then transferred to Edinburgh Royal Infirmary by an RAF helicopter, but died a short time later.
The MCA said the man got into trouble at the start of the diving expedition.
It said the man had gone into the sea but that his fellow divers had not seen bubbles rising in the water as would be expected.
They alerted the coastguard, which requested the rescue helicopter from RAF Boulmer to scramble.
Bob Abercrombie, Forth Coastguard watch manager said: “The dive boat contacted us as soon as they realised that their diver was in difficulty, so we were able to get lifeboats and a helicopter to them rapidly to assist the man.”
Fife Police has launched an investigation into the circumstances of the man’s death.
A report will be submitted to the procurator fiscal.
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