Scientists peeling away crust on submarine marvel at craftsmanship.Scientists chiseling away decades of sand & shell from Hunley forging tie to builders of historic submarine:Painstaking attention to detail.Since August 2014team of conservators using small toolsincluding dental chisels & hammershave been removing concretion coating exterior.They are looking for clues as to why Hunley sank after it became 1st submarine to sink an enemy vessel.
