[radioman193]

so if you run a Brushless motor under water
Then open it it wont be wet inside......................

and in a few runs of Mudy water if that water stays in the motor the dirt that was in the water that made it mud will dry.
and as the Motor runs After that the Dryed mud now a solid will be tossed arround in the motor and destroy the feild coil .

A brushed motor is easily rinced out with water no disassembly needed to flush it out.