Those regulations exist for a reason. If you dig tunnels underneath a city or town, you're liable to cause buildings to subside or collapse. This is not theoretical [1] - it happened in my city.

That it happened is not somehow an argument for paying less attention to tunnel digging projects either (the LCT was done at around peak "NSW government gives stupid handouts to private companies for our infrastructure").

[1] https://www.abc.net.au/news/2005-11-02/balcony-collapses-int...