Arecibo's radar had a EIRP of up to terawatts. They were basically pinging space for asteroids etc. It feels a lot like using lasers at a helicopter kind of thing. Quiet and suddenly a sharp pulse.

The cables snapped at some point. These things were tough, able to last decades. This whole thread made me think aliens cut it.

The investigation pointed to lack of maintenance.

I have seen a crab brush his eye with one of his foldable mouth arms. We already have aliens. They are more weird than anything I saw on star trek.