Mysterious Metallic Sound in the Mariana Trench Finally Identified

An otherworldly noise that was recorded near the Mariana Trench could be a never-before-heard whale call. Dubbed the "Western Pacific Biotwang," this newly discovered call might be from a minke whale — a type of baleen whale — according to the researchers who documented the vocalization. "The low-frequency moaning part is typical of baleen whales, and it's that kind of twangy sound that makes it really unique.