Junya Ishigami hides mud-covered house and restaurant below ground level in Japan

A Japanese house and restaurant are contained within this mud-covered building by architect Junya Ishigami, which was crafted by pouring concrete into holes in the ground.
Located in the city of Ube, Yamaguchi Prefecture, the building contains a home and restaurant for Japanese chef Motonori Hirata, an old friend of Ishigami's.
Junya Ishigami has hidden a house below ground level in Japan
The structure comprises a maze of cavernous spaces separated by arched openings and stalagmite-like columns,