Well, yes, water does do that, especially when there's a fountain full of it that you've just been tossed into unexpectedly.

Stuck? [What? How?] But...do you mean the TARDIS can't get us out? Really? [He pauses, and then comes to the only really logical conclusion.] Alright, what did the Doctor bollocks up? What's happened to the TARDIS? [...after all, it can't have been him, this time. He wasn't even flying the TARDIS when he'd disappeared.]