A CSAC clock continues to function when GPS signals are blocked, making it incredibly useful deep underground or underwater.

这样芯片大小的原子钟即使在全球定位系统被阻断的情况下也能继续使用，如此这般，原子表在深入地下或水中时尤其有用。

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Underground and underwater cables also send on programs from one area to another.

地下和水底电缆也可以将节目从一个地方传递到另一个地方。

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A newfound underground labyrinth filled with stone temples and pyramids-some underwater-likely relates to Maya myths of the afterlife, archaeologists said in August.

考古学家八月称，新发现的一座充满石头的神庙和金字塔的地下迷宫- - -有些部分在水下- - -貌似与玛雅神话的来世有关。

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Direct current is ideal for moving power long distances and for moving power underwater or underground.

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In reality, the bathtub was built both underground and underwater.

FORBES: The Bathtub. Lower Manhattan's Wall Against Water.

Examples include: high accuracy machine tools, deep underground tunneling machines, telecommunications equipment, underwater surveillance gear, sophisticated computers, manufacturing equipment associated with microelectronics, advanced composites and super-alloys.

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