A German U-boat that sank off the British coast during World War II has been captured on camera in remarkable images.

The pictures were taken by diving contractor Dive Newquay, which took a group of divers to see the remains of U-1021, British news agency SWNS reports. The vessel lies 9 nautical miles off the coast of Cornwall.

“The U1021 lies about nine nautical miles from Newquay Harbour and sits in 55m [180 feet] of water,” a Dive Newquay spokesperson told the news outlet. “Dives of this depth are considered technical, which require special planning and different breathing gasses.”

The wreck is near two other U-boats that also sank during the war.

U-1021 served with 31st U-boat Flotilla before disappearing in March 1945.