A carrier vehicle carries an unmanned subsea vehicle along an elongate body from a topside location to a subsea location. The carrier vehicle comprises a support structure configured to carry the unmanned subsea vehicle, and a translation mechanism comprising gripper arms connected to the support structure for causing the carrier vehicle to translate along the elongate body using a hand¬ over-hand action. The carrier vehicle can carry the subsea vehicle through a region of turbulence, such as a splash zone. This removes the need for special launch equipment to be installed on the platform to use the subsea vehicle.
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