Abstract: A submersible motor having a housing filled with a liquid dielectric. Disposed in said housing are the motor's stator and rotor. The motor is provided with a hydraulic protection system, which system comprises two chambers communicating with each other by means of a pipe disposed inside the motor housing. One of said chambers is arranged above the motor, adjacent to the end face thereof, and is filled with a liquid having a specific weight greater than that of the liquid media inside and around the motor and unmixable with said media, whereas the second chamber is arranged below the motor and filled with the same liquid dielectric as the motor housing, said second chamber communicating with the motor housing.