The Colossal Squid (Mesonychoteuthis hamiltoni) is the biggest invertebrate on Earth - a truly enormous mollusc that weighs as much as a bull moose. Yet much about it remains deeply mysterious. It is a hidden wonder of Nature, hidden away deep in the Antarctic Ocean ...

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Music

Opening & Closing Themes: Running Waters and Acoustic Meditation by Audionautix (Jason Shaw), from audionautix.com. CC BY 3.0.

Modified versions of:

Spatium by Keys of Moon, CC BY 3.0.

Light Lab, Treated Acoustic Guitar and End of WInter by Rest You Sleeping Giant, CC BY 4.0.

Abyss by Myuu, CC BY 3.0

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