This is tangentially relevant, but in my conworld I'm mainly writing about one specific country, and this country was colonized by a foreign empire. A major part of the colonial resource extraction was in the form of mining, particularly open-pit mining. When economic crises led to a lot of mining companies pulling out of the colony and simply abandoning their old mines — with these crises also leading to widespread homelessness within the colony — a lot of homeless residents actually ended up carving homes into the sides of the benches of the abandoned mining pits. A lot of these homes are still around today, albeit less hazardous and with running water — and the people who live in these homes are called "troglodytes" or "trogs" or "troggies".