An underwater boom could be the key to finally solving the decade-long mystery of the disappearance of Flight MH370.

The Malaysian Airlines flight disappeared from flight radar screens on March 8, 2014, while on a flight from Kuala Lumpur to Beijing. The plane had 239 people on board and sparked the largest search in aviation history.

The wreckage of the plane, which is believed to have crashed in the southern Indian Ocean, has still not been discovered.

But now a new theory proposed by an engineer could bring experts closer to solving this terrible puzzle.

There have been a range of theories since the plane’s disappearance – including a depressurized cabin causing a ghost flight and even a suicidal pilot orchestrating its tragic end.

Dr Usama Kadri, professor of mathematics and engineering at Cardiff University, believes underwater microphones – called hydrophones – could hold the key to locating the wreck. A split-second boom is what experts should find in the audio recordings with Dr. Kadri explaining what he listened to.

He said: “The problem with these signals (the sound of MH370) is that they are already short,” reports The Sun.

The teacher describes the sound as a sensation that passes through your body, similar to a very low organ sound.

Dr Kadri became interested in the search for MH370 and contacted the official research team based in Australia in 2014.

The doctor and his team analyzed hundreds of hours of hydrophone data from hydroacoustic stations to try to find the dam.

Dr Kadri said: “From the initial analysis it looked like we might get something (a signal). That’s when I contacted the Australian research team. I told them about the approach and that perhaps we could try to find a lower frequency (noise) coming from the event. I think they liked the idea.

“Then we shared the hydrophone data for a specific period.”

The closest hydroelectric station to the possible accident site was Cape Leeuwin, Western Australia. There was also another station located on the island of the American naval base in the Indian Ocean, Diego Gracia.

There appears to have been an unidentified event in an area known as the Seventh Arc that was captured at Leeuiwn Station. The Seventh Arc is where the last known satellite communication with MH370 took place. But the signal picked up near the Seventh Arc didn’t exactly match the crash timeline.

Dr Kadri believes the research needs to be re-examined to determine whether the signal is truly the last known trace of MH370.

Speaking previously, he said: “If you allow a little longer, just tens of minutes longer, there was a signal that came from the direction of the Seventh Arc and that signal was also highlighted by another (research) group.

“It was the only signal, the strongest, in fact, that was being picked up in that direction.”

The professor now proposed a series of controlled underwater explosions or airgun blasts along the seventh arc to see if they could isolate a more precise location for MH370.

He explained that while the official narrative suggests the plane crashed in a specific location, within a narrow time frame the impact can be recreated and the signals can be studied.