Scientists may have finally proven Alaska’s lake monster—and what they found makes Jaws look tame. For decades, locals reported something massive lurking in Lake Iliamna, some claiming to spot a creature longer than a boat.

Lake Iliamna in southwest Alaska is one of the largest bodies of fresh water in the United States. It stretches roughly 77 miles long and 22 miles across, with depths reaching more than 1,000 feet in places. The area around it is remote wilderness, accessible mainly by small aircraft. Indigenous communities have lived along its shores for generations.For a long time, local oral traditions describe…