The Joint Agency of Coordination Center(JACC) for the search of the missing Malaysian Airlines Flight MH370 announced on Thursday the areas searched by the autonomous underwater vehicle Bluefin-21 can be discounted as the final resting place of the ill-fated aircraft.??

The data collected on yesterday's mission has been analysed, said the JACC in a statement. "No signs of aircraft debris have been found" by Bluefin-21 after scouring over 850 square kilometres of the ocean floor, said the statement.

The Australian Transport Safety Bureau (ATSB) has advised that the search in the vicinity of the acoustic detections can now be considered complete and in its professional judgement, the area can now be discounted as the final resting place of MH370.?

The search for MH370 continues and now involves three major stages: reviewing all existing information and analysis to define a search zone of up to 60,000 square kilometres along the arc in the southern Indian Ocean; conducting a bathymetric survey to map the sea floor in the defined search area; and acquiring the specialist services required for a comprehensive search of the sea floor in that area.

The expert satellite working group continues to review and refine complex analyses of radar and satellite data and aircraft performance data to determine where the aircraft most likely entered the water, said the JACC statement.?

The Chinese survey ship Zhu Kezhen has already begun conducting the bathymetric survey—or mapping of the ocean floor—of the areas provided by the ATSB. Its operations are being supported by the Chinese ship Haixun 01 and Malaysian vessel Bunga Mas 6 which are assisting with transporting the survey data to Fremantle weekly for further processing by Geoscience Australia. A contracted survey vessel will join the Zhu Kezhen in June.

The bathymetric survey is expected to take about three months, said the JACC.?Knowing the seafloor terrain is crucial to enabling the subsequent underwater search.

The underwater search will aim to locate the aircraft and any evidence (such as aircraft debris and flight recorders) to assist with the Malaysian investigation of the disappearance of MH370, said the JACC.

"It is anticipated that this component of the search will begin in August and take up to 12 months," said the JACC.

The ATSB will shortly release a formal request for tender to source the capability to undertake the underwater search. A single prime contractor will be chosen to bring together and manage the expertise, equipment and vessels to carry out the search, said the JACC.