Abstract: The invention is concerned with an apparatus which can be used underwater for applying paint to a submerged surface, such as the hull of a ship, by remote control from the surface, hence obviating the use of divers and, in the case of ships' hulls, the necessity of placing the ship in dry-dock. The submersible painting apparatus comprises a remotely-controllable vehicle capable of being driven along, while adhering to, a submerged surface and a remotely-controllable painting means located at the rear of the vehicle capable of applying to a submerged surface paint formulated for application underwater. The submersible painting apparatus advantageously incorporates a device for surveying submerged structures, for example measuring the thickness of a ship's hull or detecting flaws or depressions in the hull of a vessel.