What about submerging in distilled water? Would that remove heat faster than mineral oil?
LOL do it, I always love jackass movie, but reality ones are the best.
distilled water may be non (or close to non) conductive, but it will quickly become conductive as impurities leech into it.
This is correct, deionized water has very high affinity for any impurities, partly because water is such a good solvent. It will leach from solid metals, and pull CO2 from the air and become conductive again quickly. There are some high voltage systems that use deionized water as a insulator and to remove heat, eg some XPS instruments use this setup (and far-fetched projects like Sandia's Z-Machine). However, they have a deionization system that automatically turns on periodically to polish the water, but these are extremely expensive: it'd cost more to setup these than a few mining boxes.