Dropping through the twilight

It was high noon in July, but the light soon faded. I dropped through the twilight, alone with the white rope, which stretched before me in a monotonous perspective of blank white signposts.

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Cousteau describing the exploration of the rapture of the deep in The Silent World. It’s a first hand account of the experience of delirium as the diver descends below 200 feet with an aqualung.