Answer: Giant squid live in the Twilight Zone — deep underwater — at depths ranging 1,000 feet to 2,000 feet. Because the giant squid lives deep down in the ocean, there is not quite a lot even exploration scientists would know about them. We have observed the tiniest of the giant squid in the wild. Most of what we know about them transpires from the bodies of dead squid which have washed ashore or been pulled up in fishermen’s nets. The largest squid ever spotted by zoologists was the ... The giant squid ( Architeuthis dux ) is a legendary deep-sea inhabitant, renowned for its immense size and elusive nature. Reaching lengths of up to 40 feet or more, it is one of the largest invertebrates on Earth. Lurking in the shadowy depths of the ocean, the giant squid is one of the most mysterious and elusive creatures on Earth. Rarely seen by humans, these deep-sea giants have inspired maritime legends for centuries.