Disclosed are apparatuses and methods for the adaptation of a subsea vehicle, such as an ROV, and in particular a hydraulically powered construction or maintenance work ROV. In one embodiment the vehicle is provided with a module or modules which provide further propulsion means that have reduced noise at high speed in comparison to the vehicle's main propulsion means. The module or modules also optionally provide greater performance and decreased drag. An ROV adapted in such a way is therefore suitable for high speed survey work. In another embodiment a hydraulic ROV is adapted to enable it to be able to directly drive electrically powered tools.