Something large and mysterious has been leaving a trail of carnage in the waters off Montauk, New York.
The alarm was raised recently when a number of grizzly finds hinted at the presence of a large carnivore - a ferocious creature capable of leaving a humpback whale with a 24-inch bite mark and a huge 400-pound tuna torn to shreds.
The hunt for the culprit is the subject of a new episode of the Discovery Channel's Shark Week entitled Sharkzilla Takes New York.
According to shark scientist Craig O'Connell, the attacks could be indicative of a large predator, the likes of which the area hasn't seen in years.
He is also open to the possibility that radioactive waste in the waters of the region might have produced a 'mutant' shark.
"In the past, this is the place you came to catch monster sharks," he said.
"There are so many records right here off the shores of Montauk."
"All these monster sharks were completely fished out. They're gone."
"But all the evidence we are seeing is telling me that all these big sharks might be back. I know those big sharks are out there, and we are going to find them."