Robot submarine Challenger Deep recorded the chilling alien sounds while on a mission into the deepest part of the world's oceans.
When it returned to surface experts were met with a soundtrack of low rumbles, strange moans and high pitched screeching.
The sub had plunged into the Mariana Trench in the Pacific, a world of total darkness nearly seven miles beneath the surface and filled with mysterious creatures never before discovered.
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"It's very distinct, with all these crazy parts"
Sharon Nieukirk
The sounds - nicknamed the Western Pacific Biotwang - have been probed by scientists ever since the dive backs through the end of 2014 and beginning of 2015.
One 3.5-second recording picked up by the Challenger Deep was particularly creepy, featuring a low moan followed by an almost bird-song like screech.
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But now experts have announced they have solved the mystery - it is actually a never before heard type of whale-song.
Scientists suspect the monstrous moaning is sounds coming from minke whales - a type of baleen whale.
The boffins are now trying to work out what the horrifying noises actually mean - with the twanging moan being recorded all year round.
Sharon Nieukirk, lead author of the research paper from Oregon State University, said: "It's very distinct, with all these crazy parts."
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She said: "The low-frequency moaning part is typical of baleen whales, and it's that kind of twangy sound that makes it really unique.
"We don't find many new baleen whale calls."
The wider purpose of the study of sound in the deep is to work if human-created noise in the ocean is getting louder.
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