N O P E
I DO NOT PERMIT IT
This makes a lot of sense…oh God…The Doctor has never drowned before either…ooh…that’s a very Moffat move…
You do realise that you can’t regenerate from drowning, right? (Turn Left and all …)
I was just thinking about that, it’s true. But Moffat does make up his own rules to mess with continuity all the time. (Paradoxes here and there, John Hurt’s randomly appearing Nth Doctor. He could also say that this is not the alternate world of Turn Left, either…)
Also, Eleven could be near drowned and Clara or someone attempts revival, and it’s just enough for The Doctor’s body to allow himself to regenerate. It’s possible.
HOLY SHIT. Moffat might have planned this all along. Those clues. UGH.