These children are water-cooled.
An example of someone water-cooled is a person playing in the sprinklers on a very hot day.
water-cooled - Computer Definition
A cooling system that uses water. Like a car, water cooling systems for electronics circulate water in a loop between the heat sources and a cooling radiator. In personal computers, the components that generate the most heat are the CPU chip and GPU (graphics processor chip). Every second, trillions and quadrillions of transistor state changes take place, which generate substantial heat. See CPU, GPU and active area. Faster and Quieter Water cooling systems appeal to people who push the envelope and build personal computers with the fastest chips, because water cooling is very efficient. They also eliminate large, noisy fans. Water cooling is not new. Some early computers and large mainframes were water cooled, but gave way to air cooling as advancing chip technology reduced their overall size. Water cooling a room-sized computer required extensive plumbing.