Deep Thinker
in September 1979, the oceanographer Sylvia Earle donned an armoured diving suit, was strapped to the front of a small submarine, and dropped into the Pacific Ocean off the Hawaiian island of Oahu. A few metres down, the thunder of the surf and squawking of the seagulls had disappeared. At 100 metres the light started to fade. By 200 metres it was almost pitch black. At an incredible 381 metres, the sub hit the seabed with a clunk and Earle untethered herself and
