Whichever comes out on top, though, it is clear that astronomers believe there is treasure to be found at the bottom of the sea.

ECONOMIST: Neutrino astronomy: Deep and meaningful | The

This was quite easy, because the sand at the bottom of the hole was very soft and fine and dry, like sea-sand.

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The road dips a precipitous path along the ridge from where the deep geological gash of the Great Rift Valley cascades downwards to meet its bottom at the Dead Sea, 400m below sea level.

BBC: Travelling the slow route to Petra

In a sense, but only if we cling to a linear scale of intelligence that places sea sponges at the bottom and humans at the top.

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