National Search and Rescue Agency chief Henry Bambang Soelistyo said that rescue teams discovered more wreckage despite the strong current and poor visibility.
"Apart from the fuselage, we found what we suspected as the aircraft's cockpit and also an engine," he said. "We also found what seems to be a passenger seat in which we thought there still bodies tied on it."
He did not specify whether or not the seat was inside the fuselage section that sits on the seabed at a depth of 28 meters (92 feet). The 30-meter-long (100-foot-long) part of the plane body with a wing attached was sighted Wednesday.
Soelistyo said the failure of the underwater examination of the wreckage left no option but to lift the fuselage, either by using floating balloons as the tail part was lifted early this week, or using cranes from tugboats. He did not say when the operation would start.
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He added that one victim's body was recovered on Friday, raising the total to 51. The plane had 162 people on board when it disappeared Dec. 28 en route from Surabaya, Indonesia, to Singapore.
Bad weather is a suspected factor in the crash. The plane's flight data and cockpit flight recorders were retrieved earlier this week and will be key to learning the cause.