Homebrew PCBs

Hi,


whille looking around for a shop vac to catch drilling dust i had an idea.

If i set up the CNC for EDM anyway, why not simply drill the boards under  
water?

Then the water could simply be discarded after drilling the hols and  
milling the outline.


What do you think? Any problems?
Maybe the cooling from the water would even be good? Does carbide rust?

thanks

ST