By the middle of 1987, the NRDC's seismic verification project was in a curious stage of development. American scientists had already spent a year in residence at seismic monitoring stations in Kazakhstan, and the NRDC had built virtually identical stations in California and Nevada to monitor nuclear explosions at the Nevada Test Site. But the hopes of the project's initiators had been frustrated in two ways. First, the Soviet scientists had not been given the same right to work in the United States that their American counterparts were enjoying in the Soviet Union. Second, although NRDC's operation of the stations in the United States was unrestricted, so that these stations could provide continuous monitoring of test site activity, the Soviets required the Kazakhstan stations to be shut down during Soviet nuclear tests.