Moving the Great Kanto earthquake to 1941

What if the Great Kanto earthquake happened in 1941 instead of 1923?

Japan is predicted to lose one of its super-battleships; another suggested effect on its forces is unclear in the captions.

Moving the earthquake to 1941 changes the hypothetical state of Japan's navy. The clear part of the reply predicts the loss of one super-battleship, without identifying a ship or explaining the mechanism.