Aw come on, it's just a long hole
You just need a few Navvies and a couple of spades, keep them in Guiness, dead simple. Can probably find the gang down the local to! They're always skint by Sunday lunch.

Who needs coffer dams, shields, explosive charges and all that Health & Safety crapola!

__________________
For eager & reliable recall, be fun for the dog to come back to! Then often send them off right away to do what they wanted!
DT&B - Glossary of acronyms & jargon terms.
Encouraging good behaviours, whilst consistently avoiding practise of bad alternatives leads to extinction of the bad. So if dog sits 6/10 times it doesn't sit 4/10 times, encouraging with the right rewards (positively-reinforcing) enough for 9/10 times means it now fails to sit only 1/10 times, sit 10/10 means...

Can you give some examples? I'm still struggling to find anything that is in 'another language' as you say. People get technical over technical topics...I don't understand what's wrong with answering people with the same level of terminology. It makes for a relevant and valid argument.