Marine requirements for floating drydocks are non-existant. They fall under insurance requirements as far as I know because they are attached to land. Anyone can correct me if I am wrong.
Halifax Shipyard lost one of their docks about 10 years ago to a sudden failure.
A Chief Engineer told me about having to call the docking manager in the middle of the night because of a sudden list of another dock.
So this happened in Russia:
https://gcaptain.com/worlds-biggest-dry ... t-carrier/