The structure built to lift a massive warship out of the water suddenly disappeared beneath it. How could a floating dry dock sink—and how did the aircraft carrier escape?

On 30 October 2018, the PD-50 floating dry dock sank near Murmansk as Russia’s only aircraft carrier, Admiral Kuznetsov, was being taken out. A dockside crane crashed onto its flight deck. The carrier remained afloat and was moved to another shipyard, but the repair operation had become an emergency.

Initial shipyard statements linked the accident to interruptions in electrical power during the undocking operation. What followed exposed the enormous responsibility carried by the machinery beneath a warship.

In this episode, Engineering Frontline explores how floating dry docks work, why controlling water and balance is essential, and what happens when a structure supporting thousands of tonnes loses stability.

How did Kuznetsov survive? Why did the crane fall? And what happens to a navy’s repair plans when the dock itself becomes a wreck?

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