The humboldt squid is a deadly deep sea monster, and Steve Backshall is getting ready to swim with one. After finding out more about the biology of the squid, he gets in the water clad in chainmail to protect himself during his dive. Subscribe to Discovery UK for more great clips: http://www.youtube.com/subscription_center?add_user=DiscoveryTV Follow Discovery UK on Twitter: http://www.twitter.com/DiscoveryUK Watch Discovery UK on SkyQ and Sky+ 125, Sky Glass & Stream 138, Sky Scotland 126, Sky ROI 125, Sky Glass & Stream ROI 134, Virgin Media 177.