Why giant squid, the once mythical kraken of the deep, are still mystifying scientists 150 years after they were discovered

Giant squid live in the dark depths of the ocean, and very little is known about them to this day.

Most of what the world has learned about the gargantuan creature, which can grow up to 40 feet long and live in a world devoid of sunlight, is taken from their floating carcasses, or from the belly of sperm whales.Genetics show they've been around for about 730,000 years. They've been in human legends for hundreds of years. Giant squid are the inspiration for the "Kraken" in Norse mythology, and the beasts in Jules Verne's book "20,000 Leagues Under the Sea.

One particularly good story was written in "The Natural History of Norway" in 1755, which described the giant squid as being as large as "a number of small islands," and when the giant squid began to sink, it caused whirlpools that sucked everyone down with it.

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