Been seeing a lot of news about Arecibo telescope lately and today, in the wee morning hours, the final cable broke and it collapsed.

https://www.scientificamerican.com/article/the-arecibo-radio-telescopes-massive-platform-has-collapsed/

Why was it so important? Earth-Moon-Earth Communications (EME). Germans were the first to discover this to communicate.

It was not until the close of World War II, however, that techniques specifically intended for the purpose of bouncing radar waves off the moon to demonstrate their potential use in defense, communication, and radar astronomy were developed. The first successful attempt was carried out at Fort Monmouth, New Jersey on January 10, 1946 by a group code-named Project Diana, headed by John H. DeWitt. It was followed less than a month later, on February 6, 1946, by a second successful attempt, by a Hungarian group led by Zoltán Bay. The Communication Moon Relay project that followed led to more practical uses, including a teletype link between the naval base at Pearl Harbor, Hawaii and United States Navy headquarters in Washington, D.C. In the days before communications satellites, a link free of the vagaries of ionospheric propagation was revolutionary.

The development of communication satellites in the 1960s made this technique obsolete. However radio amateurs took up EME communication as a hobby; the first amateur radio moonbounce communication took place in 1953, and amateurs worldwide still use the technique.

More interesting is that AMATUER radio operators utilize EME to communicate.

Nellie Ohr is a ham radio operator.

https://en.wikipedia.org/wiki/Earth%E2%80%93Moon%E2%80%93Earth_communication

Did someone destroy Arecibo to stop communications?

Maybe someone with communications background can look into it more.