Its calls didn't overlap with any other whales. It spoke in a mixed dialect, reminiscent of blue and fin whales, but it was talking to neither of them.
52 Blue: The loneliest whale in the world BY LESLIE JAMISON // spider-man 2099 (1992) #4 // Inside the Nail-Biting Quest to Find the 'Loneliest Whale' BY PAKINAM AMER // spider-man 2099 (1992) #10