What? How long was I down there? [He honestly hadn't thought about it at the time but now that he's faced with the fact that he must have been down there for a good lenght of time--]

I don't think I did...I might have, hm, breathed while I was down there. [Which sounds crazy, he knows.]

I didn't go far. And the best way to see more of it was to go under so...If we go together we should be fine, I think? Might be a good idea to let someone [And by that he clearly means Ryunosuke.] know what we're trying to do.