The underwater search for MH370 is officially over. Credit:Department of Defence While Kennedy does not exclude extreme possibilities that could have made the plane impossible to spot in the search zone, he and his team argue a more likely option is the plane glided down - meaning it was manned at the end - and made it beyond the area marked out by calculations from satellite images. "If it was manned it could glide for a long way," Kennedy said. "You could glide it for further than our search area is, so I believe the logical conclusion will be well maybe that is the other scenario." Doubts that the search teams are looking in the right place will likely fuel calls for all data to be made publicly available so that academics and rival companies can pursue an "open source" solution - a collaborative public answer to the airline industry's greatest mystery. Fugro's controlled glide hypothesis is also the first time officials have leant some support to contested theories that someone was in control during the flight's final moments.

An observer on a Japan Coast Guard Gulfstream aircraft takes photos out of a window while searching for MH370. Credit:AP Since the crash there have been competing theories over whether one, both or no pilots were in control, whether it was hijacked - or whether all aboard perished and the plane was not controlled at all when it hit the water. Adding to the mystery, investigators believe someone may have deliberately switched off the plane's transponder before diverting it thousands of miles. The glide view is not supported by the investigating agencies: America's Boeing Co, France's Thales SA , US investigator the National Transportation Safety Board, British satellite company Inmarsat PLC, the UK Air Accidents Investigation Branch and the Australian Defence Science and Technology Organisation. The disappearance of MH370 is one of aviation's greatest mysteries. Credit:AP The meeting between officials from China, Australia and Malaysia is expected to discuss the future of the search. The three governments have previously agreed that unless any new credible evidence arises the search would not be extended, despite calls from victims' families.

Any further search would require a fresh round of funding from the three governments on top of the almost $180 million that has already been spent, making it the most expensive in aviation history. Deciding the search area in 2014, authorities assumed the plane had no "inputs" during its final descent, meaning there was no pilot or no conscious pilot. They believe it was on auto-pilot and spiralled when it ran out of fuel. But Kennedy said a skilled pilot could glide the plane approximately 193 km from its cruising altitude after running out of fuel. One pilot told Reuters it would be slightly less than that. For the aircraft to continue gliding after fuel has run out, someone must manually put the aircraft into a glide - nose down with controlled speed. "If you lose all power, the auto-pilot kicks out. If there is nobody at the controls, the aircraft will plummet down," said a captain with experience flying Boeing 777s - the same as MH370. Like all pilots interviewed for this story, he declined to be named given the controversy around the lost jet.

Fugro works on a "confidence level" of 95 per cent, a statistical measurement used, in Fugro's case, to indicate how certain the plane debris was not in the area they have already combed, a seabed peppered with steep cliffs and underwater volcanoes. "The end-of-flight scenarios are absolutely endless," Fugro managing director Steve Duffield said. "Which wing ran out of fuel first, did it roll this way or did it tip that way?" The Australian Transport Safety Bureau (ATSB), the agency coordinating the search, has consistently defended the defined search zone. It did not immediately respond to questions over whether it was assessing the controlled glide theory. Authorities used data provided by Inmarsat to locate the likely plunge point through communication between the plane and satellite ground station. Loading

"All survey data collected from the search for missing flight MH370 will be released," an ATSB spokesman said. Reuters