An NMR probe is provided that prevents homogeneity of the static magnetic field from being reduced in a sensitive area of an RF coil used for measuring an NMR signal. Arranged in that end portion of the underwater housing facing astern is an exhaust discharge outlet for discharging exhaust gases from an internal combustion engine connected to the propeller drive. In another embodiment, the present invention teaches edition and correction of completed and oxide-coated circuit boards by re-nano-wiring using nanoneedles of a nanoneedles array, contained in the same controlled space. A second housing surrounds the first housing and optical fibers are dispersed between the housings to provide lighting in a body cavity. The water effect device will be directed over the pool or arena area such that there is a possibility of other participants getting wet.