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Almost on every mission the astronauts did some digging, but how deep did they reach? According to this article:

The regolith is generally from 4 to 5 metres thick in mare areas and from 10 to 15 metres in the older highland regions.[3] Below this true regolith is a region of blocky and fractured bedrock created by larger impacts, which is often referred to as the "megaregolith".

So did they ever see what was beneath the regolith?

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    $\begingroup$ Yes, but when it turned out to be plywood, they... :) $\endgroup$ – uhoh Feb 13 '17 at 8:03
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So did they ever see what was beneath the regolith?

No. The Apollo program sent a deep core drill ("deep": 3 meters) on Apollo 15, 16, and 17. The deepest sample was 292 centimeters during Apollo 17.

See Apollo 17 Samples 70001 to 70006 Deep Drill Core for details on the sample.

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