If you check this picture you can see the boat right way up behind Sprite 2:
It looks like the cabin and the engine are under water along with the accessories that'll have spilled out of the boat.
Its a shame really but it does show the force of nature that the boats have been putting up with over the past few weeks and days.
Sorry for the quality of the pictures, but they were taken through the lens of my binoculars.
I've just looked through my photo records from the weekend and that capsized boat was afloat yesterday, so it must have turned turtle overnight. Possibly a combination of wind and a lot of rainwater on board sealed its fate.