In April -- May 1941 , she was converted into a blockship , with her magazines now serving as fuel tanks .
She was then modified with false gun turrets and masts to serve as a decoy for the battleship HMS Anson .
In April -- May 1941 , she was converted into a blockship , with her magazines now serving as fuel tanks , but she was then modified with false gun turrets and masts to serve as a decoy for the battleship HMS Anson .