An electrically driven propulsion system for a watercraft comprising a hull with an opening, the electrically driven propulsion system comprising: an electric motor adapted to provide a mechanical power of at least 50 kW; a transmission comprising a rotary shaft; a pulse inverter electrically coupled to the electric motor and adapted to provide an electrical supply power of at least 50 kW to the electric motor; a thrust bearing; and a common waterproof housing; wherein the electric motor, the pulse inverter and an enclosed section of the transmission are arranged inside the common waterproof housing, and wherein the common waterproof housing comprises a motor section in which the electric motor is arranged; wherein an external section of the transmission is arranged outside of the common waterproof housing and comprises a propeller coupling adapted for mounting a propeller thereto; wherein the transmission is adapted to rotationally couple the external section of the transmission to the electric motor; wherein the thrust bearing is mechanically coupled to the rotary shaft of said transmission and to the common waterproof housing and adapted to transfer a force (166, 166') applied to the transmission along an axial direction of said rotary shaft to the common waterproof housing; wherein the electrically driven propulsion system is adapted to be connected as a whole to the hull with the opening, such that at least a section of the electric motor is arranged on a first side of the opening and the propeller coupling and at least a portion of the common waterproof housing are arranged on a second side of the opening opposite to the first side, and such that a waterproof connection forms between the common waterproof housing and the hull; and wherein a width of the portion of the common waterproof housing adapted to be arranged on the second side of the opening exceeds a width of the motor section. an electric motor adapted to provide a mechanical power of at least 50 kW; a transmission comprising a rotary shaft; a pulse inverter electrically coupled to the electric motor and adapted to provide an electrical supply power of at least 50 kW to the electric motor; a thrust bearing; and a common waterproof housing; wherein the electric motor, the pulse inverter and an enclosed section of the transmission are arranged inside the common waterproof housing, and wherein the common waterproof housing comprises a motor section in which the electric motor is arranged; wherein an external section of the transmission is arranged outside of the common waterproof housing and comprises a propeller coupling adapted for mounting a propeller thereto; wherein the transmission is adapted to rotationally couple the external section of the transmission to the electric motor; wherein the thrust bearing is mechanically coupled to the rotary shaft of said transmission and to the common waterproof housing and adapted to transfer a force (166, 166') applied to the transmission along an axial direction of said rotary shaft to the common waterproof housing; wherein the electrically driven propulsion system is adapted to be connected as a whole to the hull with the opening, such that at least a section of the electric motor is arranged on a first side of the opening and the propeller coupling and at least a portion of the common waterproof housing are arranged on a second side of the opening opposite to the first side, and such that a waterproof connection forms between the common waterproof housing and the hull; and wherein a width of the portion of the common waterproof housing adapted to be arranged on the second side of the opening exceeds a width of the motor section.