Unless the holes are huge enough like 1000 feet wide, the pressure of the land above should be able to even out on the surrounding walls of the hole. Geoligical

Unless the holes are huge enough like 1000 feet wide, the pressure of the land above should be able to even out on the surrounding walls of the hole. Geoligical event similar to this are sinkholes that happen in Karst areas. But those are sinkholes. And the surface depression from that sinkhole is visible. Instead, what would be more rational to assume is that the grounds are settling (which they generally do), and the water inside the voids are being squeezed out. The water is coming into contact with softer deepwells and is bubbling to the surface.