“Jenna had started swimming in the deep end of the pity pool.”

“They didn't think it had anything to do with the war. They were sure Billy was going to pieces because his father had thrown him into the deep end of the Y.M.C.A. swimming pool when he was a little boy, and had then taken him to the rim of the Grand Canyon.”

“I started to teach him how to swim only to leave him in the deep end too soon.”

“The church is like a swimming pool. Most of the noise comes from the shallow end.”

“Because Ali did not want to see the deep pools of his kind teacher's eyes and fall into them. He didn't know how to swim.”

“The Doctor: Just had a fall. All the way down there, right to the library. Heck of a climb back up.Amelia: You're soaking wet. The Doctor: I was in the swimming pool. Amelia: You said you were in the library. The Doctor: So was the swimming pool.”