A fourth gravitational wave detector, this one in Gifu Prefecture, Japan, will join the global search for cosmic events that cause ripples in spacetime, beginning this December.

The Kamioka Gravitational-Wave Detector (KAGRA) is in its commissioning phase, according to a press release, and will join the two LIGO detectors in the United States well as the Virgo detector in Italy. The three facilities will share data, serving as independent verifiers of each other’s results.