In the Comm Center near the beginning of the game, what happens if you call the other stations besides Lambda? I've seen a few Let's Plays but everybody either just goes straight down the list which means you only hear Theta or skips straight to Lambda.

There are one or two stations that produce mostly white noise, but turn into creepy messages. Only one I could make out said something to the effect of "There's nothing left. Kill yourself." Used maybe a couple more words, but that's what I remember.

Related: subtitles are super useful in this game. Picked up some pieces of dialogue I totally missed by watching a Let's Play, because I couldn't interpret them over the other noises in the scenes.