Plenty of questions still remain two days after authorities discovered a dead body in the wheel well of a United Airlines aircraft in Hawaii.

A body was found in the wheel well of a United Airlines flight that departed Chicago’s O’Hare International Airport on Christmas Eve, the airline said in a statement. The body was found in the wheel well of one of the Boeing 787-10 aircraft’s main landing gears upon arrival in Maui,

Access to that compartment is only possible from outside the plane. The investigation is ongoing to determine how and where the stowaway boarded the compartment. The identity, gender, or possible age of the victim has not been disclosed.