The document summarizes theories about the mysterious Bermuda Triangle where planes and ships have disappeared. It is located between Puerto Rico, Florida, and Bermuda in the Atlantic Ocean. Popular theories for disappearances in the Triangle include the presence of methane gas bubbles that can sink vessels, alien abductions, remnants from the lost city of Atlantis, and human errors. However, some argue incidents are merely coincidental and not unusual for the area. The document lists several aircraft and ships reported missing in the Triangle throughout history. While the causes remain unexplained, further study of the Triangle may someday reveal the mysteries.