Jan 3, 2015 2 min read

PANGKALAN BUN, Indonesia (AP) – Indonesian officials said Saturday that they were confident wreckage of AirAsia Flight 8501 had been located after sonar equipment detected four massive objects on the ocean floor.

The biggest piece, measuring 59 feet long and 18 feet wide, appeared to be part of the jet’s body, said Henry Bambang Soelistyo, chief of the National Search and Rescue Agency.

Though strong currents and big surf have prevented divers from entering waters to get a visual of the suspected fuselage, officials are hopeful they will find many of the 162 passengers and crew who were aboard the plane still strapped in their seats inside.

So far, after nearly a week of searching, only 30 bodies have been found floating in the choppy waters.

The Airbus A320 crashed Dec. 28, halfway into a two-hour flight from Surabaya, Indonesia’s second-largest city, to Singapore. Minutes before losing contact, the pilot told air traffic control that he was approaching threatening clouds, but was denied permission to climb to a higher altitude because of heavy air traffic.

It remains unclear what caused the plane to plunge into the Java Sea, though bad weather appears to have been a factor, according to a 14-page report released by Indonesia’s Meteorology, Climatology and Geophysics Agency.

“Flight 8501 appears to have been trapped in bad weather that would have been difficult to avoid,” the report said.

While the plane’s black boxes – the flight data and cockpit voice recorders – have yet to be located, the discovery of the wreckage, especially if it is largely intact, would greatly benefit the investigation.