Based on the search results, there are many theories about what happened to Malaysia Airlines Flight 370, but no definitive answer has been found. Some of the most common theories include:

• Pilot suicide: Some believe that the pilot intentionally crashed the plane into the ocean, possibly due to personal or political reasons.

• Mechanical failure: Others think that a malfunction caused the plane to crash.

• Hijacking: Some believe that the plane was hijacked and taken to a secret location.

• UFOs: There are even some conspiracy theories that involve UFOs.

Despite extensive search efforts, the wreckage of the plane has not been found, and the exact cause of the disappearance remains a mystery. While some debris has been found, it has not provided enough information to determine what happened to the plane.