We have had a few sad incidents here like that over the years.
One was a boy dug a ‘cave’ into a sand dune that collapsed upon him.................
We used to play in gullies that are abundant in south-eastern Colorado. We had one which carved a “canyon” straight through the side of a washout to the other side which emptied into a field. It was just tall enough for us to walk through standing and just wide enough to go through sideways. There was a bell in the middle where several of us could hunker down. Keep in mind we were around 10 - 12 years old, so a grown adult would have had trouble getting through there. On top of the canyon was about ten feet of dirt... Not uncommon for kids to be running around up top while others were in the “hideout” down below. When my dad found out about it, he grabbed the neighbor and they went down there and had no problem caving in our hideout with a half stick of boom boom n a three foot hole they dug with post hole diggers. He darn near cried when we showed him where we were playing. Could have killed at least two of us (no one wanted to go in alone) and as many as a half-dozen neighborhood kids. Scary.