[3] On the 11th of April 1940, at AN3446, Unity was spotted by U-5, a German Type IIa coastal submarine commanded by Kapitänleutnant Lehmann.

U-5 fired a G7a (T1) steam powered torpedo at the Unity, which subsequently saw the bubble trail and proceeded to crash dive in heavy seas.

[4] Unity sailed from Blyth on 29 April 1940 to patrol off Norway, where she collided with the Norwegian ship Atle Jarl, sinking five minutes later.

[5] Two members of her crew, Lieutenant John Low and able Seaman Henry Miller, gave their lives by remaining behind in the flooded control room so that their shipmates could escape from the sinking vessel.

[6] The wreck is accessible by technical divers, lying at a depth between 48 and 55 metres (157 and 180 ft)[7] off the Farne Islands.