Horizon Zero Dawn: Audio Datapoint 40

 

I had trouble finding this one, so here you go.

Audio Datapoints 34-46 (if I recall correctly) are in this facility. You'll enter it automatically during the Deep Secrets of the Earth story mission, or you can re-enter it from this entrance later.

Datapoint 40 is easy to miss because it's on an upper level, unlike the others. To reach it, you'll need to find a ladder. If you stand at the entrance to the next room and look back and to the right, you'll be able to see it.

Climb up, jump around the three pins to the right, and let Aloy drop onto the upper level. Turn around and you should see it at the end of the path.