Japan Microgravity Centre (JAMIC) is a site for

microgravity The term micro-g environment (also μg, often referred to by the term microgravity) is more or less synonymous with the terms ''weightlessness'' and ''zero-g'', but emphasising that g-forces are never exactly zero—just very small (on the I ...

experiments at a 710-metre-deep abandoned coal mine at

Kamisunagawa, Hokkaido is a town located in Sorachi Subprefecture, Hokkaido, Japan. As of September 2016, the town has an estimated population of 3,278. The total area is 39.91 km2. There is a microgravity test facility located in Kamisunagawa used for astrono ...

. A capsule is dropped from the top to simulate "zero gravity". Jets accelerate the capsule to counteract air resistance. At the bottom, the capsule is slowed with gradual deceleration. Cushioning exists at the bottom for emergencies. This facility is now closed.

References

Science and technology in Japan Gravimetry Buildings and structures in Hokkaido Coal mines in Japan {{geodesy-stub