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OCR: THE WAY THINGS WORK SUBMARINE Workshop UBMARINES CAN TRAVEI both on the water surface and at varying depths beneath the sca This achieved by using system of ballast tanks which can hines hold either air or water adjusting the amount of water in the tanks, the weight and buoyang the craf can be rinciples precisely regulated The ofScience submat rine' depth can also be con trolledby swiveling fins called hydroplanes Hlstory CONNING TOWER Submersible Inventors HULL Fadex REAR HYDROPLANE FRO NT Uptions HYDROPLANE iclp Oboth Hrstor ubnersinl Help