CIMSEC is reporting that the wreck of the U-550 (one of the larger, type IX boats) has been located off Nantucket.
She was sunk, 16 April 1944, by Coast Guard manned destroyer escorts USS Joyce (DE-317) and USS Peterson (DE-152) and Navy manned USS Grandy (DE-764). All were members of Escort Division 22, the only Coast Guard Escort Division formed in WWII. Grandy was temporarily assigned to replaced Coast Guard manned USS Leopold (DE-319), which had been sunk by a homing torpedo with the loss of 171, a month earlier.
Wiki report of the incident here.
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Still remember those DE’s . Served on the DE 388 USS Lansing. North Atlantic Duty