Thus, the most important goal of the exploration program is to identify sites on Mars where groundwater is within practical drilling distance of the surface.

这样，探测工程最重要的目的就是在距离地面的实际钻井距离范围内确定地下水的位置。

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Typically it involves drilling wells to pump steam into the ground to melt the bitumen and make it easier to suck up to the surface.

典型的工艺是先钻井，然后通过井眼将蒸汽泵入地下，油砂中的沥青被蒸汽熔化，这样便容易被抽吸至地面。

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We could send a lander to drop a drilling probe through the kilometers-thick ice or attempt to find a huge fissure to access the sub-surface ocean.

我们可以发射一个着陆器，向该星球投放一个有钻头的探测器，钻通其几公里厚的冰面；或者尝试去寻找一个巨大的裂缝进入地下海洋。

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Environmental attention has recently shifted to the wastewater that comes back to the surface during drilling.

WSJ: Daniel Yergin on the Shale Gas Revolution: Stepping on the Gas

If all went without the tiniest hiccup, something that never happens when you are drilling five miles below the surface, and if the drilling proceeded at 150 feet per day as it has been recently, they could drill to the targeted depth in just five more days.

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