Re: Skills for Underground Construction
You can probably do basic entrenchment with Soldier if you've been in any army that experienced WW1 as it's taught in basic by most of them (although you might need to be qualified infantry before it becomes a no-roll task). Engineer (Combat) sounds about right for more extensive works, although anyone who understands groundwork (mining or civils) should probably be able to figure it out easily enough.
If you really want to drill down (ahem) you'll probably have gangs of labourers (with or without Digging), possibly lead by those with Professional Skill: Mining and the project overseen by one or more Engineers. Fantasy dwarves probably have all three skills and so work a lot more efficiently - hobbit builders probably take a lot of tea breaks.
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