The invention relates to an underwater propulsion unit. BR/ It refers to an assembly which comprises two motors (3A, 3B) mounted on support arms (5A, 5B) and which, when not in use, are each stored in a respective cavity (8A , 8B) of the vehicle. The support arms (5A, 5B) are rotatable about two axes relative to the submersible vehicle, their rotation about the first axis moving the motor out of the cavity and to a working position, and their rotation around the another axis moving the motor between two working positions in which it creates a thrust in two perpendicular directions. BR/ Application to unmanned underwater vehicles. / P
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