Geofront

Recently, intense interest has been shown in new frontier space development, such as waterfront and geofront, as underground space is called in Japan.

The tours covered a wide spectrum of subjects and places, including a geofront project, the Yokohama Exotic Showcase exposition, Sakaki town in Nagano.

To achieve the role of one of the world's leading international cities by the beginning of the 21st century, Tokyo must move quickly to liberate its skyfront and waterfront areas to create more living and office space, improve its infrastructure by developing its subterranean geofront, and construct the facilities necessary for an international city, especially a 24-hour airport.

However, as has been recently discussed as a topic in terms of geofront and waterfront developments, tunnelling of larger diameters and at greater depths is predicted to be necessary, so that the need for further automation and robotization is increased for the purpose of safety and improvement in productivity.

I figured you two had probably seen something like that before, but I've never even heard of these geofronts existing.