# 9. Underground Space Exploration: District Heating and Cooling Systems Supporting the Otemachi, Marunouchi, and Yurakucho Area
_9.地下空間探検～大丸有エリアを支える地域冷暖房～_

- **When:** Thu, Oct 29, 2026 10:30 (JST)
- **Where:** Marunouchi Nijubashi Building, Chiyoda — Marunouchi Nijubashi Building, 3-2-3 Marunouchi, Chiyoda-ku, Tokyo
- **Map:** https://www.google.com/maps/search/?api=1&query=35.67813,139.761238
- **Price:** ¥1,500
- **Category:** Tech & Meetups
- **Official site:** https://amazingunderground2026.peatix.com
- **On Tokyo Events:** https://eventstokyo.com/en/events/9-underground-space-exploration-district-heating-and-cooling

![](https://cdn.peatix.com/event/5192760/cover-ESnX0HlD8T6Smt5tGdjwyYzPcbSs34rc.jpeg)

There are about 100 buildings in the Otemachi, Marunouchi, and Yurakucho area. While these buildings are familiar sights, most people don't know what's beneath them.

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Source: Tokyo Events — https://eventstokyo.com/en/events/9-underground-space-exploration-district-heating-and-cooling