Something absolutely massive has washed up on the shore of a beach in Indonesia, specifically the Maluku province, and it’s an incredibly terrifying sight. Experts aren’t quite sure what the animal is. Many have speculated that it’s either a whale or a giant squid, but no one seems to be sure.

A local man found the huge carcass on Hulung Beach on Serum Island Tuesday night, according to a report from the Jakarta Globe. Asrul Tuanakota, 37, mistook the dead animal for a stranded boat at first, until he got up close, the report states.

The Jakarta Post is calling it a giant squid, but not everyone is so sure, with other reports saying it’s more likely to be a dead whale. The animal appears to measure nearly 50 feet in length.

“The unusual finding attracted scores of residents to Hulung Beach at Iha village in West Seram district,” the Jakarta Post reported. “The reason for the giant squid washing up on the shore is still unknown, but it is believed to have been dead for at least three days before it was found.”

It’s only been in the last few years that the giant squid has been photographed and captured on video in the wild, and even dead giant squid bodies are relatively rare finds, especially one of this size. If confirmed, it would be the latest in a string of discoveries over the centuries of this mysterious creature.