This naval platform of the type comprising a missile pit (10) above the outer deck of the platform and defined by at least two side walls (11, 12) constituting bulwarks extending at the periphery of the platform and masking, for an incidence close to the horizontal of the platform, one or more missiles arranged on at least one inclined ramp (13, 14) for the launching thereof above a bulwark of the platform, and means (17) for evacuating the gases or missiles, is characterised in that the means (17) for evacuating the gases comprise at least one elbow duct forming a gas deflector, one end of which is positioned opposite the rear of the missile and another end of which is facing the upper portion of the missile pit above the deck of the platform.
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