Underwater Darkness at 2000 Meters Defines the Colossal Squid's World

At depths of two kilometers, sunlight is completely absent, creating a permanent night.

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The bathypelagic zone is sometimes called the midnight zone due to its perpetual darkness.

Mesonychoteuthis hamiltoni inhabits bathypelagic zones where sunlight does not penetrate. In this environment, vision depends on detecting faint bioluminescent signals rather than reflected light.

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The absence of light shapes nearly every aspect of the squid's biology, from its enormous eyes to its likely stealth-based hunting approach.

Exploring such depths requires advanced submersibles and remotely operated vehicles, meaning much of the colossal squid's natural behavior remains undocumented.

Source

NOAA Ocean Service

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