Japan's Underground Mega Highway Nobody Talks About

Beneath the crowded streets of Tokyo lies a massive highway that most people never see — the Yamate Tunnel. Built deep underground through one of the world's most densely developed cities, the tunnel carries traffic beneath buildings, railways, rivers, and entire neighborhoods. Instead of taking valuable surface land, Japan pushed the highway beneath the city using massive tunnel boring machines and complex underground engineering. From tunnel boring machines and ventilation systems to emergency safety infrastructure and underground junctions, discover how Tokyo built another layer of its transportation network beneath the city. Chapters 00:00 — Japan's Underground Mega Highway 00:45 — Why Tokyo Had to Go Underground 01:22 — Why Tokyo Needed an Underground Highway 03:14 — Digging a Highway Under Tokyo 04:56 — The Highway Beneath the City 06:46 — Making a Highway Safe Underground 08:44 — A Highway That Changed Tokyo 10:22 — The City That Built Below Itself 11:49 — The Hidden Highway Beneath Tokyo Subscribe for more documentaries about mega projects, engineering, infrastructure, transportation, technology, and the hidden systems behind modern cities. #Japan #Tokyo #YamateTunnel #UndergroundHighway #JapanInfrastructure