That would depend on the purpose of the dike... and who/what was downstream.
That said, see my profile for a description of "PDKL 95". There is a good chance I'd grab the jackhammer if it would somehow lead to a useful re-framing of the consensual hallucination.
> ... a real risk that technology will happen faster than our ability to assimilate those technologies ...
> ... the alternative is to give into natural selection as yet another species that didn't adapt to its environment fast enough.
I guess if you came across a hole in the dike, the small thing you can change would be to grab a jackhammer?