Relatives of the Anglin brothers, who famously escaped from Alcatraz in 1962, say they have proof the two men survived, according to InquisitrJohn and Clarence Anglin escaped the infamous prison along with Frank Morris using a raft they crafted out of raincoats. They were never seen again, and investigators determined that the men must have drowned in their attempt to get to San Francisco from the island prison.

Or did they? David and Ken Widner are nephews of the Anglins, and they say they have evidence that the men, in fact, survived to make it to the shore. Their mother, Mary Anglin Widner, is the sister of the two escapees. The evidence they have includes Christmas cards, and even a photo showing that the two men were alive in the 1970s, rather than drowned at sea a decade before. The evidence can be seen on a new documentary on The History Channel, which is scheduled to air on Monday.

Alcatraz was known as an inescapable prison when the three men dug a tunnel using metal spoons to create an exit route. They made fake heads of toilet paper, hair and soap to fool guards during nightly bed checks and then escaped on the raft made of raincoats, according to The Mirror.

No trace of the three men has ever been found, though authorities died recover pieces of their watercraft. Thier famous escape has been the subject of debate and speculation since that fateful June night in 1962.

If the three men drowned as the official investigation claims, then Alcatraz continues to be a prison fortress that was open for 29 years with no successful escapes, according to Canada Journal. Otherwise, the three men re-wrote history.