Exemplary embodiments of the present disclosure directed towards a non-destructive device configured to survey, inspect, and clean marine growth, comprising: manipulators comprising adjustable clamps configured to move or rotate 360 degrees for holding at least one cylindrical shape of an offshore structure; a plurality of hydraulic rams configured to hydraulically operate and control the plurality of manipulators; a central part comprising a camera and light emitting diodes configured to provide visual aid to a user and a lidar configured to determine ranges by targeting the offshore structure with a laser and measure the time for reflected light to return to a programming logic circuit board; probes configured to survey angular and distance measures of objects around the offshore structure, and inspections of safety and security of the offshore; and a high pressure jetting nozzle configured to clean the marine growth and rotary arms of the offshore structure.

The invention relates to an underwater cleaner (1), especially for a swimming pool, comprising a housing (2) in which an especially battery-powered pump having an electric motor (4) and an impeller (3) is arranged, wherein the housing (2) comprises an inlet opening (23) and an outlet opening (22) for a flow path, said flow path forming a first channel section (13) originating from the first inlet opening (23) and a second channel section (14) accommodating the impeller (3), wherein the second channel section (14) is arranged in an inclined manner in relation to the first channel section (13), and wherein the impeller axis (18) is arranged in an inclined manner in relation to a normal (24) to the opening cross-section of the inlet opening (23). The ratio A/B of a first cross-sectional surface A to a second cross-sectional surface B is less than 2.8, wherein the first cross-sectional surface A is defined by the smallest flow cross-section in the first channel section (13) and the second cross-sectional surface B by the smallest flow cross-section of the second channel section (14) directly at the pump inlet.

In order to obtain the simplest possible underwater cleaner (1) with the lowest production costs, which offers high suction power with low flow losses even in the case of impellers (3) of relatively large diameters, the first channel section (13) converges continuously into the second channel section (14).

A cleaning head for cleaning a submerged surface includes a body portion, and a skirt portion extending around a periphery of the body portion, the skirt portion performing a sealing function between the body portion and a submerged surface desired to be cleaned when the cleaning head is disposed on the submerged surface during use. The cleaning head also includes at least one cleaning member for causing material on the submerged surface to separate from the submerged surface when the cleaning head is disposed on the submerged surface during use, and at least one suction aperture in fluid communication with a space defined between the body portion and the submerged surface during use.