The Boeing 747-100 operated by Qantas Airways as Flight QF30 departed from Hong Kong international airport to Melbourne on July 25, 2008. When it was cruising 29.000 ft over the South China Sea, one emergency oxygen cylinder burst and ripped a hole through the right side of the forward cargo hold. The flight crew conducted an emergency descent and landing to Manila. Damage to the airliner was substancial but none on board was injured. Here in attached you can read interesting article about it. Though this type of accidents are becoming less frequent, we should not overlook real cases like this to improve our knowledge on this key safety matter


** B-747 Qantas Rapid Depressurization
     Mark Lacagnina / Flight Safety Foundation
     AerosafetyWorld/ December 2010-January 2011