NOC's vocalizations were recorded and studied by a team of biologists from the National Marine Mammal Foundation (NMMF) led by Sam Ridgway. In 1984, Ridgway and others at the NMMF began to hear peculiar sounds coming from the whale and dolphin enclosure. They were reminiscent of two people talking in the distance, the words just beyond the limit of comprehension.[5] Later, a diver working in the enclosure came to the surface after he heard someone cry "out, out, out!"[1] After he asked his colleagues "Who told me to get out?", they realized it had been NOC.

https://en.wikipedia.org/wiki/NOC_(whale)