There is the hulk of a Sunderland in Sullom Voe, Shetlands. Apparently it came back from a patrol full of holes and was taxiied up onto the launching ramp before it sank. The old girl was stripped of everything useful and towed out into "deep" water to sink. The upper surface of the wings were just visible at the equinox low tides when I was there in the early Eighties.
arthur h I showed the supposed picture of the Windemere Sunderland to a chap who reads sonar images for a living and he reckoned it was "suspect" with conflicting shadows and too high a level of detail.