U-966 was heavily damaged by Allied bombers in November 1943, so the crew blew it up with timed charges and all but eight reached dry land, BBC reported on Friday.
US Navy and RAF Liberator bombers targeted U-966 with depth charges for a whole day, as the German submarine zig-zagged and fired its anti-aircraft gun.
One Allied plane was shot down - reportedly an RAF Catalina flying boat.
An RAF Wellington bomber also took part in the submarine chase and dropped depth charges.
The three divers' discovery in late June followed years of searching in a very rocky area where rough weather often makes diving impossible. The debris was photographed at a depth of 24-26m (79-85ft).
One of the divers, naval historian Yago Abilleira, said they had found the wreckage near Estaca de Bares and it was spread over a wide area. They are not revealing the exact location, as it is a war grave.
He told the local paper La Voz de Galicia (in Spanish) that the crew had scuttled U-966, nicknamed "Gut Holz" (Good Wood), "in desperation, as Allied planes were attacking them on all sides and they knew time was running out".'
Spanish media say the divers now want to find the downed Allied plane, believed to be near the U-boat wreck.
A German naval history website, Ubootarchiv.de, says (in German) that three local fishing boats rescued submariners who were clinging to rocks offshore. The crew totalled 52, eight of whom died.
U-boat commander Eckehard Wolf flew back to Germany in November 1944 from Spain under a false name, the website reports.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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