Located on an island in San Francisco Bay, Alcatraz was once considered one of the country’s most secure prisons.

But that didn’t stop three prisoners from making a daring escape the night of June 11, 1962.

They set sail across the bay on a homemade raft made of raincoats.

Then they vanished. What happened to them? Explore the theories and discover why their escape has become one of history’s greatest mysteries.