Explanation emerges for why it got flooded (incl. generators and engines) so quickly, the ships of these class are fitted with a hollow propeller shaft. So damage to the shaft allowed water to flow inside shaft and emerge here and there, passing through any existing watertighting system. Now the Norwegians and Spanish are quarelling about who is responsible for the construction choices defects.
But a great solution has been found :O) they have put some inflatable plastic bags inside the propeller shaft, to (possibly) block water ingress. So these 1\2 billion euros ships needs some pieces of plastic to save them from built-in sinking properties. lol.