The Bloop

A sound from the deep Pacific louder than any animal should make. Ice, said NOAA. Eventually.

The Bloop (1997): an ultra-low-frequency sound recorded by NOAA hydrophones across 5,000 km, louder than any known biological source. NOAA's eventual attribution — icequake (cryoseism) from Antarctic ice shelf fracturing — is published and accepted; the spectral match is documented. The node stays because it is the archive's model case: a real anomaly, a multi-year explanatory gap (during which the Cthulhu jokes calcified into belief), and a mundane resolution that never achieved the legend's circulation.