The satellite view shows this off much better than Wikipedia's ground-level picture. It Really is just a long band of holes dug into the side of a mountain.
At 1m diameter and 75cm deep, so ~0.59m^3, I calculate that to fill the Albert Hall, which a search suggests "has been estimated at" ~100,000m^3 (feels low to me, but it's quoted in many places), it takes around 170,000 of these Peruvian holes.
Obviously the rescuers should have just used a stick and push them back until they are de-deformed by undergoing the reverse process, on a serious note I think the author should have gone further, one is that it should show a pregnant lady going into one of the holes, just to put that mental image in the readers, and second, it should have a bonus page where we are shown that the bodies melt into the ground once they make it out, and then when they seem like they are dead they make a strange sound until the rescuers conclude that are trying to say "kill me"
https://www.google.com/maps/place/13%C2%B042'20.0%22S+75%C2%...