Do you have foxes in the area? The scream could have been caused by one, but I've never heard one yell for that long. It also sounds similar to a bobcat, but again, considering how drawn out the scream was, I'm not sure. We've got bobcats down here (not foxes though), and while they do have some pretty loving creepy screams (especially when heard from a distance), I don't think they usually go on for that long unless the animal is in distress or sending a warning to a nearby critter.
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Listening to it again, if it was a fox or bobcat, it sounds pretty forgeted up. Also (as I'm sure you've noticed), there are two screams: a rather long one, and then a fainter, shorter one. The second scream sounds a lot more like an animal than the first, but a human being is definitely capable of making such a noise.
Dunno man, animal or not, I wouldn't forget around there long if I heard that lmao
I also wouldn't rule out the possibility that someone saw you head over to the depression and they were trying to spook you away from their hangout/smoke spot or whatever. Happened to me once before in an abandoned house here in the mountains. I was alone at the time, so I GTFO'd quick, but noticed people watching me as I left. Just stay safe dude, and if you do go again, bring someone with you
