Geotech drilling - they are doing it NOW

So, some pegs appeared on the neighbours front lawn a few days ago, and today they turned up, spent an hour making loud noises and then packed up.  I went and had a chat with them (not that they wanted to tell me anything at all), and it turns out that they could "only drill down 12 metres because it is too soft."  Too soft for what?  How far did they want to drill?  What does this mean?  They told me they need to go 20 metres, but they have other places they can drill in the area.  THAT tells me nothing.  Bugger.                                                                                                                                             

They turned up with this big silver truck, unloaded the machinery, drilled, packed up and left.  Here's the photographic evidence.  I dare say this is the last we will hear of it for MONTHS.