Note, according to the Chinese edition of #12, the last line from Kaga is "Don't tell me, the one who turned Zuikaku into her current form is..."

That is the signal for the Final Operation. At the time, the Abyssals will launch an all out attack against the Naval Base. All of you, please follow the action plan on the back, and use all your force to hold the line. If we can withstand the Enemy's attacks until the last, it will be our victory. With the conclusion of the defensive battle, the war will also be concluded. Above are the Admiral's orders. And following is my personal request: In the event that you fight against any humanoid Abyssals, ensure that you do not aim to sink them.