And here is more information from a greek video with english subs about Coober Pedy and some more video footage of the Serbian underground cave church.
Amazing Egyptian Cave Churches are Carved Out of Solid Rock in Cairo
In an area known as "Garbage City," seven beautiful cave churches unexpectedly rise against the backdrop of Mokattam hills. Located in southeast Cairo, these Coptic Christian churches were created by the Zabbaleen, a community of garbage collectors who make their living collecting and recycling 15,000 tons of garbage produced by Cairo's 17.8 million residents.
A marginalized minority of Coptic Christians in a Muslim-majority country, the Zabbaleen were forcibly relocated to the outskirts of Cairo by the government in 1969. After creating a new home at Mokattam, they also carved the Monastery of Saint Simon into the entrance of a hill near the community...
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Amazing Egyptian Cave Churches are Carved Out of Solid Rock in Cairo
In an area known as "Garbage City," seven beautiful cave churches unexpectedly rise against the backdrop of Mokattam hills. Located in southeast Cairo, these Coptic Christian churches were created by the Zabbaleen, a community of garbage collectors who make their living collecting and recycling 15,000 tons of garbage produced by Cairo's 17.8 million residents.
A marginalized minority of Coptic Christians in a Muslim-majority country, the Zabbaleen were forcibly relocated to the outskirts of Cairo by the government in 1969. After creating a new home at Mokattam, they also carved the Monastery of Saint Simon into the entrance of a hill near the community...