Fall into a giant futuristic pit

It's just a giant metal hole with lights floating in the air. You start at around 2 million studs up in the sky and you can jump down into the pit, takes a bit to get all the way down but you will land on a default baseplate eventually. T to toggle trail, F to toggle light, R to toggle ragdoll. Also, note that the lights in the pit can sort of start "flashing" after a bit because you're going so fast down, so don't play if you are sensitive to that.