Australian investigators began examining a Qantas jumbo jet which had to make an emergency landing after a large hole opened on its fuselage on Saturday.

The Boeing 747-400 was cruising at 29,000 feet with 346 passengers Friday when it was shaken by an explosive bang. The plane descended rapidly before landing safely minutes later at the Manila airport. There were no injuries among the passengers and crew, but some of the passengers suffered nausea.

Passengers of Flight QF 30, enroute to Melbourne from London, had just been served meal after a stopover in Hong Kong when they heard a loud bang. After disembarking, they saw a gaping 9-foot wide hole at the joint where the front of the right wing attaches to the plane. Luggage from the cargo hold strained against the webbing used to keep it from shifting during a flight.

The passengers boarded another Qantas plane to Melbourne before midnight Friday.

Investigators failed to determine the cause of the hole; however, evidence shows that terrorism is not linked to the incident.