All computers power hungry or otherwise, emit heat when operational. That is why you are advised by manufacturers to avoid blocking your computer’s vents, which they use to get rid of the heat generated inside. Servers on the other hand are the powerful industrial counterparts to your regular desktop PC at home. The modern data centers of today used for data processing and distribution among many others, are likely to have thousands of such servers running 24/7.
This makes cloud service providers like Microsoft (companies responsible for setting up and maintaining these data centers) spend $1.5 billion every year to keep the servers cool. As the days pass, Microsoft will require more data centers to keep up with the demand, adding into the already steep maintenance and cooling costs.
In order to optimise this, Microsoft has decided to put their servers underwater. Water is capable of storing more heat energy than air while maintaining its temperature, which makes the cold depths of the ocean a better candidate for exchanging the heat from a data center.
Watch this video by Techquickie to know more: