Re: The dangers of prior assumptions
The problem is that the boring tool you need for one soil or rock type is not the appropriate choice for another soil or rock type.
Plus the ground can just be a sod (no pun intended) sometimes.
Even in London, with a well known stratigraphy, site investigation boreholes sometimes come back with 'no recovery' at certain depths, and that happens with (as I just noted) a good idea of what we're boring, the right kit in good condition with good, skilled, drillers operating it.
I suspect that this thing has basically one type of coring bit, which has to handle any and all rock types its operators want to try and core. From the article, it seems they mistook a very weakly cemented silt (soil) for a more competent rock.
Biting the hand that feeds IT
