Vivienne didn't say anything the whole time she led Mister Turner into the water within the upside down boat. Even after he accused her of doing something so crazy, she didn't say anything. Though being called a genius had a good ring to it as well. "An underwater air-bubble. You should try it sometime", she simply advised him while giving the capsized boat a mighty push as they walked upon the ocean floor. 

Unlike William, her thoughts were elsewhere, only trying to figure out how she will explain this to Vane when they get to Nassau [b]without[/b] being scolded. Maybe Mister Silver will talk upon her behalf? This points to the fact that she wasn't truly the one in charge, nor was the [i]Ranger[/i] even her ship to begin with. The pirate pushed her thoughts aside, once they managed to get below the hidden ship. "Mister Turner, take a breath", she advised before pushing the boat away, letting all the water come rushing in, and releasing themselves into the open ocean. Swimming herself to the surface, she and Will were spotted by Silver's spyglass. "Throw down a rope!", he ordered the men, until they threw a rope over the side, allowing them to climb up.