Am 04.02.2011 15:24, schrieb Invisible:
> Those of you who have played HalfLife two will be familiar with the
> giant thumper machines they use to keep the antlions at bay. Well the
> other day, I drove through a building site, and they had a machine
> exactly like this. Same size and everything. (Although it was yellow
> rather than black.) What in the name of God...?

Sampe working principle, too - except that instead of driving off 
antlions, they drive stuff into the earth. Typically steel piles for a 
retaining wall.

They're usually mobile though.

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