The following submission statement was provided by /u/asbruckman:

I found this podcast fascinating. While early search for extraterrestrial intelligent life looked for radio signals, newer work is looking for "technosignals" like signs of pollution. There are two new space telescopes being designed specifically with features to look for these technosignals. If either is launched, it will be two decades from now or longer. The challenging science problem right now is: what signals should we look for?

There was an interesting discussion of the fact that many exoplanets are covered in water. If an intelligent species evolved that was aquatic, what kinds of technologies might they develop and what would signals of their tech look like?

Please reply to OP's comment here: https://old.reddit.com/r/Futurology/comments/xznoru/podcast_the_search_for_extraterrestrial/irn3uby/