England, Northumberland, Blyth. Red & white safety barriers and lifebuoy on South Blyth Sea Front, photographed on a foggy morning.

Scotland, Orkney Islands, Churchill Barrier. Churchill Barrier No. 3, linking Glimps Holm and Burray, built by prisoners of war in WW2 to protect the Royal Navy anchorage in Scapa Flow from German U-boats.

Scotland, Orkney Islands, Churchill Barrier. Churchill Barrier No. 3, linking Glimps Holm and Burray, built by prisoners of war in WW2 to protect the Royal Navy anchorage in Scapa Flow from German U-boats.

Scotland, Orkney Islands, Churchill Barrier. Churchill Barrier No. 3, linking Glimps Holm and Burray, built by prisoners of war in WW2 to protect the Royal Navy anchorage in Scapa Flow from German U-boats.

Scotland, Orkney Islands, Churchill Barrier. Churchill Barrier No. 3, linking Glimps Holm and Burray, built by prisoners of war in WW2 to protect the Royal Navy anchorage in Scapa Flow from German U-boats.

Scotland, Orkney Islands, Sunken Block Ship. Sunken Block Ship, near Churchill Barrier No. 3 linking Glimps Holm and Burray, sunk to protect the Royal Navy anchorage in Scapa Flow from German U-boats.

Scotland, Orkney Islands, Churchill Barrier. Churchill Barrier No. 3, linking Glimps Holm and Burray, built by prisoners of war in WW2 to protect the Royal Navy anchorage in Scapa Flow from German U-boats.

Scotland, Orkney Islands, Churchill Barrier. Churchill Barrier No. 3, linking Glimps Holm and Burray, built by prisoners of war in WW2 to protect the Royal Navy anchorage in Scapa Flow from German U-boats.

Scotland, Orkney Islands, Churchill Barrier. Churchill Barrier No. 4, linking Burray and South Ronaldsay, built by prisoners of war in WW2 to protect the Royal Navy anchorage in Scapa Flow from German U-boats.