The main instrument of the observatory was the Arecibo Telescope, a 305 m (1,000 ft) spherical reflector dish built into a natural sinkhole, a cable-mount steerable receiver mounted 150 m (492 ft) above the dish, and several radar transmitters for emitting signals. Completed in 1963, the Arecibo Telescope was the world's largest single-aperture telescope for 57 years, surpassed in July 2016 by the Five-hundred-meter Aperture Spherical Telescope (FAST) in China. The Arecibo Telescope suffered catastrophic structural failure on December 1, 2020 after two cable breaks in the previous months. The Observatory also includes a radio telescope, a Lidar facility, and a visitor's center which are expected to remain operational after assessing the damage from the main telescope collapse. The observatory was an icon of the Puerto Rican space and science industry.