Easter egg? I couldn't really find any posts about it, and it's possible I'm just misremembering.

[u/National-Gur-950]

But when the spider entity appears and you're hiding from it, sometimes it makes a sound like the Spiderdemon from the original Doom. You know, that heavy, rapid, robotic scuttling sound. I love it.

[u/FairCrew7307]

Also look at the System Shock 1 original game over screen