PROBLEM TO BE SOLVED: To provide an underwater visible light communication system in which a wavelength of visible light is varied in accordance with the situation of water quality and further the time of driving using a battery is prolonged.;SOLUTION: Among visible light of a plurality of kinds of wavelengths emitted from a visible light radiation device 9 of an underwater mobile 1, a wavelength of strongest light reaching a visible light-receiving section 15 of an observation apparatus 3 is determined by a wavelength determination section 31. The observation apparatus 3 selects the visible light of the wavelength determined by the wavelength determination section 31 as visible light for transmission, contains observation data in the visible light and emits it from a visible light radiation device 11 into water. A visible light-receiving section 13 of the underwater mobile 1 demodulates received visible light to acquire the observation data.;COPYRIGHT: (C)2010,JPO&INPIT
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