Officials in Hawaii are investigating after a body was discovered in the wheel well of a United Airlines plane that flew from Chicago to Maui on Christmas Eve.

A plane wheel well is a compartment in the wings or fuselage where the landing gear is stored when not in use. It is a hazardous location for stowaways, who could encounter low oxygen levels, hypothermia, crushing, or the risk of falling during the flight.

A body has been found in the wheel well of a United Airlines plane that landed in Maui, Hawaii on Tuesday, Dec. 24.