This is unfortunately a reality which you might have to face so it's better to be prepared for it. If you coolant leaks then turn your machine off as soon as you see the leak. Then unplug the machine right from the socket itself. After that take off the case panels so that you can access the water block. Then bring paper towels and use it to mop up the liquid as best as you can. After that fake-out all the components that got drenched or even touched by the liquid. Dry each of the components very carefully. Leave everything alone for 2 days to properly dry. After that put it all back together and pray it works.