Mystery Atlas
Theory

Giant Sea Creature Hypothesis

The popular speculation that the Bloop's sound was produced by a marine animal larger than any known species, including the blue whale; driven by the sound's biological-sounding acoustic profile before NOAA's 2005 identification, and never treated as a serious possibility by marine biologists given the animal size such a call would require.

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Related Mysteries

  • The Bloop

    Giant Sea Creature Hypothesis attempts to explain The Bloop — Popular internet and media speculation prior to 2005, never treated as a serious possibility by marine biologists given the animal size the sound's amplitude would imply.

Theories & Explanations

Creatures & Figures

  • Loch Ness Monstermodern legend from 1933

    Giant Sea Creature Hypothesis is frequently compared to Loch Ness Monster — Both are 'undiscovered giant aquatic creature' claims that readers of one commonly encounter alongside the other.

Explored on these pages

What Was the Bloop?

What the Bloop was: the 1997 ultra-low-frequency ocean sound once linked to a giant sea creature, and NOAA's 2005 icequake identification.