Today is the day. Hope lots of people participate.
This is my Hydro room. An underground river was harnessed to spin some turbines, and generate electricity. The water is then pumped underground and chilled, as well as electrified, so it becomes sterile for use. Purple light is ultra violet.
I'm only a few days into this room. I was inspired by Half-Life, but I did not use any concept art or anything. Just sort of sketched it out in Spark without planning, made sure I had a solid greybox before starting.