Someone actually is trying that idea in Georgia right now (https://www.thedrive.com/news/34648/capsized-cargo-ship-in-georgia-with-4200-cars-aboard-will-be-cut-

Someone actually is trying that idea in Georgia right now (https://www.thedrive.com/news/34648/capsized-cargo-ship-in-georgia-with-4200-cars-aboard-will-be-cut-into-pieces-with-a-giant-chain https://www.thedrive.com/news/34648/capsized-cargo-ship-in-g...) but it really is not easy! Many likely problems: equipment avilability to do so, time it will take, debris falling off and from the operations, risk of capsizing, probably need to load pieces on barges/crane but canal is not much large