A breakthrough in the disappearance of Flight MH370 could be made within the next four years, Malaysia Airlines CEO Peter Bellew said Wednesday. The flight went missing on March 8, 2014, with 239 people on board on its way to Beijing from Kuala Lumpur.

"(Given) the advances in scientific research around the location where the aircraft may have gone down ... I personally would be very surprised if in the next three or four years, we don't get a breakthrough. I think that's the timescale we're looking at," Bellew told CNBC.

Read: Missing Flight MH370 Search Reveals Mysteries Of Deep Ocean

Despite a multimillion-dollar search in remote parts of the southern Indian Ocean, the Boeing 777-200 could not be found. Several debris pieces also washed up at various locations but could not unravel the mystery behind the disappearance of the jet.

Last week, Australia released maps of the ocean floor where Flight MH370 was believed to have crashed. However, authorities have released information collected during the search of the plane in detailed maps of the sea floor, and which many scientists think could be useful in future ocean research.

The search for the plane was called off in January but Australian authorities said it’s possible the search could continue in the future if concrete evidence about the jet's location was found.

“We remain hopeful that new information will come to light and that at some point in the future the aircraft will be located,” Australia’s Transport Minister Darren Chester said earlier.

On July 13, Seychelles Civil Aviation Authority (SCAA) said two debris pieces found in the island nation of Seychelles could possibly be from the missing Flight MH370.

"The direction of flow of the sea currents make it likely that the (debris) came from the general direction where other parts (of MH370) have been found in Indian Ocean countries," a senior SCAA official, who spoke on the condition of anonymity, told Reuters at the time. The SCAA said in a statement they contacted Malaysian authorities "who have shown an interest, and with whom we expect to work closely."

The plane's disappearance has also raised several conspiracy theories which went as far as a hijack or a terrorist attack. Some theorists also claimed the pilot of the plane may have deliberately crashed the plane.

Read: Possible MH370 Debris Found In Seychelles, Malaysia Notified

In March, an independent analysis by a team of aviation and mathematical experts concluded the aircraft was in a “spiral dive” moments before it crashed into the ocean. The report confirmed the Australian Transport Safety Bureau’s conclusion about the plane’s final moments.

“Considering that the newly available data generally support the conclusions of the official investigators, it remains a mystery as to why Malaysia withheld the data for so long and why it chose to release the data at this time,” Victor Iannello of the Independent Group said, the West Australian reported..