The lifeboat crew were paged at 1048 this morning to go to the assistance of a sick diver in Scapa Flow.
The lifeboat left the berth at 1057 and transferred the casualty on board from the dive boat at 1113.
The crew gave first aid and the lifeboat arrived back in Stromness harbour at 1128 where a doctor was waiting to transfer the casualty to an ambulance for a check-up.
He was was given the 'all clear' and was later spotted walking down the street by one of the lifeboat crew.
Key facts about the RNLI
The RNLI charity saves lives at sea. Its volunteers provide a 24-hour search and rescue service around the United Kingdom and Republic of Ireland coasts. The RNLI operates over 238 lifeboat stations in the UK and Ireland and more than 240 lifeguard units on beaches around the UK and Channel Islands. The RNLI is independent of Coastguard and government and depends on voluntary donations and legacies to maintain its rescue service. Since the RNLI was founded in 1824, its lifeboat crews and lifeguards have saved over 142,700 lives.