Russia's sole aircraft carrier, the "Admiral Kuznetsov", was damaged during repairs on Oct 30, 2018, when the drydock holding her sank.
One shipyard worker went missing and four were injured in the accident. A70-tonne crane toppled from the drydock's wing wall onto Kuznetsov's deck, leaving a hole measuring four to five meters across.
A response team succesfully floated and removed the "Admiral Kuznetsov" from the drydock during the sinking.
No vitally important parts of the carrier were damaged, according to United Shipbuilding Corporation .
Reparis were estimated to take a week and a half for the welders. The damage would not disrupt the schedule for her repairs.
Kuznetsov is scheduled to be out of service for a deep overhaul until 2021.
The extensive scope of work included the replacement of her notoriously failure-prone boilers.
The Cold War-era vessel has a long history of breakdowns, and she has historically traveled with a fleet tug when she sails abroad.
The failed drydock "PD-50" is a key facility at the 82nd Repair Shipyard in Murmansk.
The Soviet-era dock measures 330 meters by 88 meters, has a capacity of 80,000 tonnes and was equipped with two tower cranes.
Among other noteworthy projects, the PD-50 received the wreckage of the ill-fated nuclear submarine Kursk after its sinking in 2000.
The drydock will likely be refloated and repaired, though the timeline for its salvage is uncertain.
Russian oil and gas company Rosneft is the majority shareholder of the 82nd Repair Shipyard, and state-owned United Shipbuilding Corporation is considering a lawsuit against Rosneft for expenses related to the casualty.
An electrical failure could have led to the abnormal immersion of the dock's port side.
While the sinking is unlikely to delay repairs to the Kuznetsov, it will impact the schedule for work on the other military vessels that were awaiting their turn in drydock.