The blue creature floating over the seafloor is a Cirrothauma, the only blind octopus on Earth. Its eyes have no lens and no iris, just a bit of tissue buried in its head that can tell light from dark. It cannot see you.It lives between about a mile and three miles down, in pitch-black water just above freezing, where sunlight never reaches. One was even found under Arctic sea ice. The pressure down there is hundreds of times what you feel standing on a beach.Almost everything about it works in