Crane dropping ground penetrator - GIF

Crane dropping ground penetrator. Not really sure what this is.

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Previously:

https://www.homemadetools.net/forum/...023#post207242
https://www.homemadetools.net/forum/...734#post206211
https://www.homemadetools.net/forum/...071#post141081
https://www.homemadetools.net/forum/...804#post129173
https://www.homemadetools.net/forum/...302#post181098

better for soft ground I wood think to keep it from collapsing back in..

Penetrating mother earth.

Interesting. Is this a quick way to make holes for piles if all you have is a crane? Or is it something for a geotechnical survey?

Might be a compaction tester

Looks like an oversized plumb bob.

tom&jerry.....Im gonna get that mouse!!!

The crane operator probably just wanted some Chinese food for lunch and thought he could drive a hole deep enough to get the real stuff from China...