Watch as we build a stunning underground swimming pool, crafted with durable, high-quality materials for long-lasting luxury. This unique design also features a private underground living room, ...

A hidden paradise beneath the earth! Watch as we create a luxurious underground cave swimming pool with a private living room, using only primitive tools and natural materials! From digging deep into ...

The cavity has expanded to 40m across, almost the length of an Olympic swimming pool, since opening up in a city just north ...