Subscribe | UPI Odd Newsletter Subscribe QUINCY, Mass., Aug. 17 (UPI) -- A group of fishermen off Massachusetts captured video of their encounter with an estimated 15- to-16-foot great white shark that circled their boat. Frank Duggan, who shot the video Thursday in Cape Cod Bay, said he and his fellow fishermen came across three sharks feeding on a whale carcass. Advertisement Duggan, captain of the Outer Limits II of Quincy, said one of the sharks broke away from the group to circle the fishing vessel. The men aboard the boat estimated the massive shark was 15 or 16 feet long. Read More Fisherman carries exhausted shark back out to sea Boaters rescue shark hooked to buoy off Florida coast New Jersey teens catch and release 6-foot shark