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U-778 is a boat accessible salt water dive site, located in Inistrahull Light, Ireland. The maximum depth is over 150ft/46m.

Operation Deadlight (post-war Allied operation, info)
While in tow for the scuttling ground on 4 December, 1945 she foundered and sank roughly 11 miles NE of the Inistrahull Light, in position 55.32N, 07.70W. 16 miles off Malin Head on the County Donegal coast

Innes McCartney dove on this boat in 2001 (see his report).

Depth: 220 feet (67 meters)
Position (lat, long): 55.32, -7.30

News about diver loss on wreck;

More info;

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