The work of rotating the Confederate submarine H.L. Hunley is taking longer than expected.
Officials say the sub has been rotated about 30 degrees but the job won't be complete until Friday. A laser monitoring system had to be readjusted Thursday and the sub's bow started to dip, so workers had to level it again.
The delicate process of righting the submarine started Wednesday at a lab in North Charleston as workers slowly adjusted the tension on slings holding the sub. It will reveal the entire hull for the first time in nearly 150 years and may provide clues as to its fate.
The hand-cranked Hunley is the first sub to sink an enemy warship. It sank on its side off Charleston in 1864 and was raised in 2000.