Ever since the weird alien-like sounds were first recorded back in 2014, and all thoughout the spring of 2015, deep down in the Marianas Trench National Monuments, scientists have been trying to identify its origins.

For months, experts remained baffled and could not come up with a valid explanation for the mysterious sounds. Now, new reports are suggesting that the sound might have been generated by something more terrestrial as opposed to a myriad of other speculated sources.

The sound, which is now being called the "Western Pacific Biotwang," was recorded by a deep sea acoustic device exploring different regions of the 246,000 km2 Marianas Trench National Monuments, just east of Guam.

The 3.5-second recording is described to contain hints of biological and metallic sounds that has never been heard before. The frequencies within the recording range from 38 hertz to 8,000 hertz, all within range of human hearing.

Listen to the sound here:

Upon further study, scientists concluded that the sounds could not have come from any natural sources, such as earthquakes, ships, ice, or rain. They concluded that the complex sound could have only come from a biological source. A recently published research posted in The Journal of the Acoustical Society of America, now claims that the sound itself likely came from a unique species of the Baleen Whale.

The study claims that the sound was likely generated by a Dwarf Mike, a subspecies of the common Minke Whale. The Minke Whale is also a sub class of Baleen Whales, which are known to make similar "boing" noises as their distinct mating call.

Despite the findings, some scientists argue that the sound could not have come from the Whale, as the Baleen Whale's mating calls are often only heard during the winter. The Western Pacific Biotwang on the other hand was recorded all throughout the year.

The researchers who wrote the study do however admit that they could be wrong and that the sound itself could have come from another source.