Dark5 presents 5 of the most mysterious and creepy audio recordings of unexplained sounds coming from the depths of the ocean. Subscribe for new Dark5 ►► http://bit.ly/dark5 Like Dark5 on Facebook ► http://bit.ly/Dark5FB Follow Dark5 on Twitter ► http://bit.ly/Dark5Tweets Think you've heard it all? Inspired by a new mysterious sound heard pinging in the arctic and scaring away animals in 2016, Dark5 brings you a different take on the 5 most mysterious underwater sounds ever recorded. Hear the nightmare fuel voice of NOC - a whale trying to talk like a human, the unsettling tones of the still unidentified "Upsweep," the strange quacking sounds that followed Russian submarines, and the eerie calls of a whale deep in the Mariana Trench right before a magnitude 5 earthquake during a research mission to study underwater sounds.