>>509493906>electronicsThey're passive humbuckers, no electronics involved, just wires. Provided he manages to dry it off, his biggest concern for that would be rusting.
The real problem here is the wood absorbing the water and expanding, it'll warp the whole body. There's a reason old acoustic guitars sound better than newer ones, and it's because it takes years for that tail end of the logarithmic scale regarding moisture leaving the wood.