Jacksonville’s most historic shipwreck may have been damaged by submerged telephone cables draped over or through its 152-year-old wooden bones, according to the man who led its archaeological exploration in the 1980s and ’90s off Mandarin Point. So Keith Holland is pushing the U.S. Army Corps of Engineers to get the cables moved from the National Historic Landmark site of the Union steamship Maple Leaf and the thousands of U.S.