Have you heard of the DB Cooper case? It might be the most mysterious disappearance in American history.

On November 24, 1971, a man claiming to be Dan Cooper boarded a Northwest Orient Airlines 727 from Portland to Seattle. The guy was dressed neatly, behaved calmly, but told the flight attendant he had a bomb. He demanded $20,000 in cash, four parachutes, and asked the plane to land in Seattle to refuel.

At the time, it was simply crazy—no one knew if it was a real threat or a scam. But what was the most outrageous? They gave him the money and parachutes, and the passengers were released. Then DB Cooper, on a rainy night over Washington state, opened the rear cabin door of the plane and jumped out. Just like that, he disappeared.

Since then, no one has seen him again. The FBI launched one of the largest manhunts in history, but found nothing. Until 1980, when a young boy in Washington state dug up $5,800 in ransom money near the Columbia River, confirming it wasn’t just a hoax.

What really happened with DB Cooper remains a subject of debate. Some believe he died after jumping over that treacherous terrain on that harsh night, never surviving. Others insist he successfully escaped and may have hidden in Canada or somewhere else, living on. Many suspects have been studied, but none could be confirmed as DB Cooper.

The FBI officially closed the case in 2016, but that didn’t stop amateur detectives from digging for clues. This guy could have been an experienced skydiver, or just a lucky rookie—no one knows.

The DB Cooper incident has become part of American culture, turned into documentaries, books, and even movies. Over fifty years have passed, and it’s still an unsolved mystery. What do you think? Did he die during that jump, or did he really escape?