150519-N-SU274-011 CHARLESTOWN, Mass. (May 19, 2015) The entire hull of USS Constitution is exposed for the first time in 19 years as Dry Dock 1 in Charlestown Navy Yard is dewatered. Constitution entered the dock last night to commence a multi-year planned restoration period. (U.S. Navy photo by Mass Communication Specialist 2nd Class Peter Melkus/Released)