Re: Oil Bath
I should take a picture of the system I built like that. I took about 30 1U server boards (Old Dell PE-1850 boards), used a bunch of 2 inch motherboard standoffs to link them together and dunked them into a 50 gallon fish tank full of mineral oil. The tank was originally designed for cold-water fish so had a big cooling rod built into it (got it surplus from the local NOAA / Oceanic Research lab).
The monstrosity was used to house a compute cluster for research lab. They didn't have space for a dedicated server closet and everything in lab had to be explosion-resistant, so the servers were dunked into the tank along with a pair of 48-port switches with fiber GBICs to communicate with the outside world