That’s a great video. I was at a site in Indonesia where a huge boulder (20-foot diameter or so) had come to rest near the road.
A bunch of guys drilled holes in it manually (hit the drill bit rod with a hammer, rotate the drill bit, hit again, and repeat 1000 times. Once they had a bunch of holes drilled they were going to put clay inside the holes which would expand and crack the boulder into smaller pieces.
I’m guessing using explosives would be too dangerous with the road and buildings nearby.
When I worked in China in the mid 70s, they cast a concrete pedestal for the boiler stack about 2 feet two high. They had jackhammers and excavators to use, but nope. They have a dozen guys crude chisels formed from soft steel rebar and put them to work chiseling it down. I was flabbergasted. Whenever I heard the claim that “China has no unemployment,” I knew the real reason why.