The loneliest whale in the world has been swimming for decades unable to socialise with its own species.
Dubbed 52 Hertz due to his singing frequency, scientists say nothing in the water can understand him.
Typically a blue whale will communicate between 10 and 39 Hz while a fin whale will sing at 20Hz – far lower than the Pacific Ocean's finned enigma.
As a result when a whale hears 52 Hertz trying to bond with them, it heartbreakingly sounds to them like gibberish just as their response sounds to him.
"Nobody can understand it. He's basically speaking a different language," says filmmaker Joshua Zeman.
His isolating calls were first picked up by baffled US military personnel in 1989.
Their network of hydrophones were laid across the ocean floor to listen out for Soviet submarines during the cold war so alarms were raised at the sound of 52 Hertz.
At the same time far lower frequency moans from other whales were picked up in the ocean, revealing just how much they sang to each other.
As the need to listen for foreign vessels fizzled out, the Pentagon handed over the network of hydrophones to whale researchers, The Guardian reports.
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This summer saw the release of Zeman's documentary, The Loneliest Whale: The Search for 52, executive produced by Leonardo Di Caprio
In the film, a crew of researchers scour the Pacific Ocean looking for 52 Hertz, whose unique voice has been picked up by scientists ever since it was discovered.
There was a real fear among the team however that he may have died.
Zeman told Inverse the hunt was like a "Heist movie".
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John Calambokidis who features heavily in the documentary says: "Any scientist would be captivated by the opportunity to solve that mystery."
Another scientist, John Hildebrand adds: "There’s just so much we don’t know".
What really captivated Zeman in wanting to document a massive scientific expedition at sea was the emotion attached to 52 Hertz.
He had broken up with a partner at the time of hearing about the whale whose loneliness he immediately resonated with, Inverse reports.
He said: "Nobody wants to die alone. That's our biggest fear."
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The film includes different views from scientists about just how lonely 52 really is, according to one expert it is "without a doubt".
Whale communications expert Christopher Clark of Cornell University says other whales can hear 52, they just do not know what to make of him.
Clark told the BBC in 2015: "Blue whales, fin whales and humpback whales: all these whales can hear this guy; they’re not deaf. He’s just odd."
For Texas A&M University associate professor, Ana Širović, it remains a mystery how much other whales engage with 52 on the back of his songs.
Širović said: "The question is what do these other whales perceive it as? What does it mean to them? Is it strange and something they completely ignore? Or is it something that they understand to be just slightly off from their own signals?"
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