How a Liquid-Cooled Computer Operates Underwater. A water-cooled computer submerged underwater may sound impossible, but it's a fascinating and efficient way to boost performance. The key is that the liquid is not water—it’s a non-conductive substance like mineral oil. This liquid allows the computer to remain fully operational without the risk of short circuits. The system works by transferring heat away from critical components, making it possible to overclock hardware safely. The bubbles you