The world's largest invertebrate remained hidden from humanity until a tantalising glimpse 100 years ago. But it would be decades before we come face to face with the colossal squid.

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Over 75 extremely rare sea creatures — about “20% of the entire population” — were spotted off the coast of Maine, photos show. Photo by Leon Bredella via Unsplash Over 75 extremely rare ...

In 1863, a Russian paleontologist and mining engineer made his way through the Eocene strata of the Caucasus to the shores of the Caspian Sea ... of ghost islands and strange fireballs over ...

This story and others are collated in Smith’s book “The World Beneath: The Life and Times of Unknown Sea Creatures and Coral Reefs,” published in November in the US and January in the UK.