Percussion drilling - GIF

Percussion drilling.

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Previously:

Air percussion rock driller - video
Drilling a deep hole - GIF
Compacting loose earth by dropping weights - GIF
Kola Superdeep Borehole - photos

What's the advantage over conventional drilling?

Looks very similar to the Tallboy bomb...

https://en.wikipedia.org/wiki/Tallboy_(bomb)

which was used for a very similar application.

How do they get it back out of the ground? There must be a energy efficencie advantage over drilling.