Officials said they are confident that four large objects that have been detected by sonar equipment in the search for the remains of AirAsia 8501 are wreckage from the aircraft. CCTV’s Barnaby Lo reported this story from Surabaya, Indonesia.

The biggest piece, measuring 18 meters (59 feet) long and 5.4 meters (18 feet) wide, appeared to be part of the jet’s body, said Henry Bambang Soelistyo, chief of the National Search and Rescue Agency in Indonesia.

Bad weather and sea conditions have hampered the search for more debris and bodies, as well as the flight’s black box, all week. A remote underwater vehicle had been deployed to capture images, but high waves and strong currents were hindering the task, as well as divers from searching underwater. However with more technologically-capable vessels and foreign experts involved, authorities said they made progress.

There were 162 people aboard the plane, but after a week of searching, only 30 bodies have been found floating in the choppy waters. Twelve bodies, known only by the numbers on their coffins for now, arrived in Surabaya almost a week after they left the same city for Singapore crashing midway into the Java Sea.

“Yes, we are convinced that these objects are parts of the AirAsia plane. But we still want and need visual confirmation,” Vice Air Marshal Widodo of the Indonesia Navy said.

Meanwhile, Surabaya’s airport, had fewer AirAsia flights. The airline’s Surabaya-Singapore route was suspended, after the country’s transportation ministry revealed it wasn’t authorized to fly on that day that the flight crashed into the sea.

Story compiled with information from CCTV America and AP reports.