Recommended
Mineral Oil Submerged PC Build Log Part 1 - Puget Systems Kit Case Assembly
Why people recommend it
A demonstration of a computer submerged in mineral oil for cooling, often cited when people ask about liquid immersion instead of fans and heatsinks.
Watch for: Shown as an example of enthusiast immersion cooling
In their words
Cooling by submerging in mineral oil has been done for a long time by enthusiast computer builders, a good example is this
DavidTheWin on electronics.stackexchange.com, Mar 2016. CC BY-SA.