It is known that the distribution of groundwater is uneven, and that much of it lies at great depths.

大家知道，地下水的分布是不均匀的，而且它们大部分都埋在很深的地方。

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The plumes apparently originate at great depths, perhaps as deep as the boundary between the core and the mantle, and many have been active for a very long time.

这些地幔柱显然起源于很深的地方，可能深至地核和地幔之间的边界，而且许多都已经活跃了很长时间。

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Typically living at great depths, giant squid sightings are uncommon and often undocumented.

尤其是生活在很深的地方，巨乌贼通常并不常见而不被记载。

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The government also brought in Chile's navy, whose submariners have experience working at great depths in confined spaces.

ECONOMIST: Chile's mine rescue

Wells are being drilled horizontally at great depths in a variety of formations all around the country, and that means each location may require different techniques.

WSJ: Industry giant GE aims to improve fracking

These stories, and others concerning extraordinary feats in extreme cold, at great depths underwater, in sporting arenas and in outer space, are the starting points for Dr Ashcroft's careful explanations of how the human body copes at the limits of endurance.

ECONOMIST: The science of survival