So far, authorities have used radar, satellites, aircraft and ultrasound waves to search for the missing Malaysia Airlines flight MH370.
However, a very simple thing could be the key to revealing the location of the plane. And that is the sound signal wave underwater.
Researchers believe the answer could lie in the sound signal recordings used to track changes in ocean pressures.
These records are part of a global network set up to detect nuclear explosions.
Recently, experts also confirmed that they have discovered MH370 debris on Google Maps.
But now they are planning to use explosions at sea and underwater sound signals to solve the mystery of Flight MH370.
The Conversation reported that a group of scientists from Cardiff University (UK) led by Dr Usama Kadri have conducted a new study exploring the ability to detect underwater sound signals generated by plane crashes, such as the believed impact of MH370. The group used hydrophone technology - recording sound waves and pressure changes in the ocean.
Several underwater sound receiving devices were operating at the Leeuwin Cape of Western Australia and the US Navy base in the Indian Ocean at the time of the mysterious disappearance of MH370.
Dr Usama Kadri leads a team searching for clues in recordings of other plane crashes.
He then reviewed what was done in the final minutes of Flight MH370.
A 200-ton plane falling at 200 meters per second will release momentum equivalent to a small earthquake, he wrote in The Conversation. It will be big enough to be recorded using hydrophones thousands of kilometers away, he added.
Previous analysis by scientists at the University of Curtin and later by the team confirmed the signal of an unknown source recorded at the Cape Leeuwin station, towards the 7th arc. The 7th arc is understood to be a location within a radius of 120km from the last estimated position of MH370.
Dr. Kadri published the results in the journal Nature Scientific Reports.
However, even these findings cannot pinpoint the exact location of the MH370 crash. Therefore, Dr. Kadri suggested using controlled explosions to help search for the missing Boeing 777-200ER.
The technique was previously used to help search for Argentina's San Juan Submarine that went missing in 2018.
Researchers hope that new techniques can help in the search for MH370.
