With regard to "original" ESCs; I'm sure they were the original ones, but due to the fact that the bird was powered up when it hit the water, there were probably 3-phase impulse spikes that compromised the circuitry; probably similar to hard crashes when powered up. I'm not an electronics guru, but I'm sure there are a few out there that can demystify 3-phase complexities. After inspecting EVERY electrical component, (including disassembling all circuit boards in the camera), I have to conclude that the electrical components in the Phantom copters DO have some sort of protective coating, (albeit very thin), otherwise they wouldn't be so forgiving in recovering full function from FRESH water crashes. Saltwater is another issue.