waterproof brushless motor

i will be expecting my quadrocopter to be wet (completely soaked in water)  so should i use a brushed or a brushless motor? 

there's an australian company that custom built a quadrocopter to go underwater and i asked them what motor they used and they said they used the Turnigy 924kv Brushless Motors... i thought that brushless motor would be spoiled if underwater?.... pls help 

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  • My friend is doing a senior design project for Seabotix (remotely-piloted underwater rovers), and they are using an unsealed electric brushless motor to control one of the arm joints. The company even sells "special" thrusters that are designed to be used underwater, and they are nothing more than caged brushless motors.

    But hey, a salad bowl works too?
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