A sick crewman has been airlifted from a British submarine around 320km off Erris Head on the Co Mayo coast.
A British Coast Guard Helicopter, which flew from Stornoway in the Outer Hebrides, arrived at the submarine and airlifted the man from the vessel at about 10am.
The helicopter was to fly to Sligo Airport for refuelling before bringing the man to hospital in Glasgow.
A fixed-wing aircraft, also based at Stornoway, flew with the helicopter to provide cover.
The man is believed to be suffering from abdominal pain, but the details of his condition are not known.
The Irish Coast Guard assisted in the operation.
Crewman airlifted from oil rig
In a separate incident, the Shannon Coast Guard Helicopter was called out to an oil rig off the south coast, off the Old Head of Kinsale, to airlift a sick crewman to hospital in Co Cork.
The man, who is believed to be Scottish, was on board the Arctic 3 rig.
It is understood he was suffering from abdominal problems, though the illness is not believed to be life threatening.
