I assume you mean “2 guys and some heavy equipment”? As a kid it took me a whole summer of on-and-off digging to make a 1 meter deep hole for fun.
As a kid, my cousin, my sister, and myself were able to dig a hole deep enough for me to be completely inside in an hour or two using a post hole digger. (Yes, this is a very stupid idea.)
More importantly, geothermal/ground source is rarely 1 well either, in our case it was 8.
It’s just a huge vertical drill with segments you add on as it goes deeper, like an oil well drill.
(although on rereading I didn’t mean to say ‘huge’ twice in my previous post)