A swimming pool cleaner discharges water jets under the cleaner body, directed toward its center from its sides, to agitate and lift debris toward one or more vacuum intake openings, to greatly enhance the cleaning ability of the cleaner. An intermediary layer of glass, ceramics, polymers, metals or composites is inserted between the materials to be bonded; this intermediary layer has a compositional gradient that could have been formed through diffusion processes. The device includes an apparatus for winding the envelope around the product and an apparatus adapted to supply the product and the envelope to the winding apparatus. Oxygen from the decomposing oxide layer may form a metal oxide with metal from the metal-containing layer. The system further includes signal processing circuitry for processing the left and right side scan sonar return signals to produce side scan image data and a digital processor for causing a display to display an underwater image based upon the side scan image data, wherein the digital processor associates GPS position and side scan image data. The drive shaft is rotated when the motor is turned on.