There’s a new effort underway to discover what happened to aviation legend Amelia Earhart, who vanished 82 years ago along with navigator Fred Noonan during an ill-fated attempt to fly around the world.

Explorers Robert Ballard, who found the Titanic and the Bismarck, and Allison Fundis, the chief operating officer for Ocean Exploration Trust, are leading the expedition to find the long-lost Lockheed Model 10-E Electra off Nikumaroro Island in Kiribati. While they search the waters, a National Geographic team plans to scour the island.

But one possible fate might be too horrible to ponder.

National Geographic reported that according to one theory, one or both may have survived a crash landing on a remote Pacific atoll, and after some period of time, died there. Then, they were devoured by crabs ― including massive coconut crabs that can measure 3 feet across from leg to leg ― that dragged their bones into burrows.

This theory could explain why colonists who attempted to settle Nikumaroro Island in Kiribati ― then called Gardner’s Island ― discovered 13 human bones.

British colonial officer Gerard Gallagher, who found the bones in 1940, claimed the rest of the remains had been dragged off by crabs. Tests at the time suggested that the bones didn’t belong to Earhart, but the bones have since been lost, making it impossible to subject them to more modern tests.

If the crab theory was correct, some of those bones could still be there on the island, just scattered and buried.

The International Group for Historic Aircraft Recovery, which has been searching for years for signs of Earhart or her aircraft, posted a video in 2014 of one of the island’s famously giant coconut crabs in its burrow: