Locals have spotted cranes working to secure the RV Petrel after it tipped over almost three weeks ago in dry dock.
The boat, a research vessel owned by the United States Navy, toppled over and injured 35 people. It was unclear how long the operation will take to right the 3,371 tonnes vessel as investigators probe the cause of the incident.
A major operation was launched as police, ambulances, the fire service and coastguard were called after the ship became dislodged from its holding at Imperial Dock in Leith, Edinburgh, at about 8.35am on March 22.
