It was at 5.20pm tonight that Shetland Coastguard was alerted to a missing diver from a dive boat off Burwick.
The Coastguard is co-ordinating a search of the Pentland Firth and the islands in the area involving RNLI lifeboats from Longhope, Thurso and Stromness as well as Coastguard rescue teams from Hoy and St Margaret’s Hope.
The Coastguard rescue helicopter from Shetland is also on scene, as well as four commercial vessels who are also assisting with the search.