Arecibo Collapsed Because of Engineering Failures That Inspectors Failed To Spot

A new engineering analysis has revealed the cause of the collapse of the Arecibo radio telescope in Puerto Rico in 2020. The failure was attributed to two main factors: an unexpected interaction between the radio electronics and the traditional cable anchoring methods, and a failure of inspections to identify the problem. The main antenna of Arecibo was suspended by three main cables, which were anchored using a system that had been used successfully for decades. However, over time, the cable bunch and zinc plug began to pull out of the socket, a phenomenon known as "zinc creep." Inspectors noted this issue but dismissed it as a concern, believing the engineering margins were still sufficient to prevent failure. The structure ultimately failed in 2020, with the first cable separating in August and the second in November. The report concluded that the zinc creep was likely accelerated by the telescope's powerful electromagnetic radiation environment. The Arecibo Telescope cables were suspended across the beam of the most powerful radio transmitter on Earth, which may have contributed to the accelerated zinc creep. The analysis provides a plausible explanation for the collapse, although it remains unprovable. The report highlights the importance of considering unique environmental factors in engineering designs.