Atwood’s wharf saw second duty as part of the Cape Cod Oil Works, established by Jonathan Cook in 1875, which extracted everything usable from the carcasses and excreta of whales and fish. To this day, the ruin of a brig hull, as elegant in its skeletal outline as an elongated wishbone, can be seen alongside the few remaining pilings of the Atwood wharf.
The historian George Bryant surmised that this vessel was deliberately sunk on the spot and used as a receptacle in which maggots feasted on whale remains until they had completely cleaned the bones, which were in demand by corset manufacturers.
Building Provincetown 
As some or all of this vessel lies in-between the high-tide and low-tide lines, I’m not sure “sunk” is the proper term here…. More importantly, however, according to the 1891 photograph linked below, this was “used as fertilizer screening house”. A later inscription at the bottom reads, “Condemned by Dr. Moore 2/6/19”.