im guessing it has some minecraft nether properties (aka 4 blocks in the overworld = 1 nether block) because when i entered the portal, it was really only darkness with a couple of lights, which were moving.

i got out of there like fucking a-train bc it creeped the shit out of me, but the lights kind of looked like that: (couldnt get a good enough look at them so this is a placeholder until i go back in)