SuperFerry 9 was a ferry owned by the Philippines-based carrier Aboitiz Transport System Corp (ATSC) and operated by their SuperFerry division. About 9am Sunday September 6, 2009, she sank off the south-west coast of Zamboanga Peninsula with a total of 971 passengers and crew aboard.The ferry was travelling from the southern city of General Santos City to Iloilo City in the central Philippines and capsized on the other side of the peninsular from Zamboanga City.On Tuesday September 8, 2009 the last missing passenger was reported rescued and more up-to-date figures were provided by disaster response officials. The civil defence figures were corrected the following night by the ship owners.

As of 6pm Wednesday September 9, 2009, "961 crew members and passengers have been accounted for. Regretfully, there are 10 fatalities. 10 names in the official manifest cannot be physically matched but we also have 10 persons rescued and physically accounted for, whose names are not in the manifest".

Roll-on/roll-off (RORO or ro-ro) ships are cargo ships designed to carry wheeled cargo, such as cars, trucks, semi-trailer trucks, buses, trailers, and railroad cars, that are driven on and off the ship on their own wheels or using a platform vehicle, such as a self-propelled modular transporter. This is in contrast to lift-on/lift-off (LoLo) vessels, which use a crane to load and unload cargo.

RORO vessels have either built-in or shore-based ramps or ferry slips that allow the cargo to be efficiently rolled on and off the vessel when in port. While smaller ferries that operate across rivers and other short distances often have built-in ramps, the term RORO is generally reserved for large oceangoing vessels. The ramps and doors may be located in the stern, bow, or sides, or any combination thereof.