probably a reference from operation crossroad, during the first test nagato survived the experiment, later she's sunk on the second test due high radiation and the leak.
As expectedWanted to see you, at the very end,AdmiralOh... So this is the world's...You did well, NagatoTo think she managed to endure thisAs expectedIt'sJust what time is it?The result of the experimentAs we had expectedAs expected from one of the Big 7
He's litteraly saying "the world's Big 7".... Ah, that's right, I