Malaysia Airjet News Update: The Bluefin 21 unmanned submarine in search of the missing Malaysia Airlines Flight MH370 continued to dive Sunday, completing about half of its search on the bottom of the Indian Ocean with no luck. The results prompted an official to express the urgent need to find something that can help solve the mysterious disappearance of the plane six weeks ago, the Associated Press reports.

In an email to The Associate Press, the search center said that the robotic submarine began its eighth trip into the depths off the coast of western Australia. Its search area forms a 10-kilometer (6.2-mile) circle around the location of an underwater signal that was believed to have come from the aircraft's black boxes before their batteries died. The sonar scan of the seafloor in that area is expected to be completed in a week's time, about five to seven days.

The U.S. Navy submarine has covered around 133 square kilometers (51 square miles) since it began diving into the depths on Monday. The latest data are being analyzed, but nothing has yet been identified, report from Time stated.

Malaysian Defense Minister Hishammuddin Hussein give emphasis on the importance of the weekend missions to reporters in Kuala Lumpur on Saturday.

"The narrowing of the search for today and tomorrow is at a very critical juncture, so I appeal to everybody around the world to pray and pray hard that we find something to work on over the next couple of days," the Defense Minister said.

He added that there were no plans to give up once the Bluefin completes its work. Instead, the scope of the search may be broadened or other assets may be used.

"The search will always continue. It is just a matter of approach. All efforts will be intensified for the next few days with regards to the underwater search," Defense Minister Hishammuddin Hussein said.

In the meantime on Sunday, up to 11 aircraft and 12 ships continued to scan the ocean surface for debris from the the missing aircraft that disappeared March 8 en route from Kuala Lumpur to Beijing with 239 people on board.

Radar and satellite data show it mysteriously turned far off course for unknown reasons and would have run out of fuel in the remote section of the southern Indian Ocean where the search has been focused. Not one piece of debris has been recovered since the massive hunt began.

According to the Associated Press, there have been numerous leads throughout the painstaking hunt, but all have turned out to be false. The latest hope involved an oil slick found near the underwater search area, but analysis of a sample taken from the site found it was not connected to the plane.

The most promising development came when four underwater signals were detected April 5 and 8. The sounds were consistent with pings that would have been emanating from the flight data and cockpit recorders' beacons before their batteries died.

On Sunday, the visual surface search was to cover an estimated 48,507 square kilometers of sea.