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A green laser water penetration system devised by Sylvania Electronic Systems in the late 1970's. Although advertised for fisheries use, this technology hasevolved into LIDAR, a system for measuring shallow-water bathymetry and also for into a rapid terrain mapping technique. In: Farooq Hussain, 1970, LivingUnderwater, p. 87. Library Call Number GC65 H8 1970b. (Image credit: Archival Photography by Steve Nicklas)