What happens if you get water up your nose?

NO, water will not go up your nose when your snorkeling. They make the snorkel a special way. You are very safe!!!!

AnswerActually the snorkel has nothing to do with the nose. Your nose is safely covered by the mask, so as long as your mask is not full of water, your nose stays nice and dry.

The only chance of water going up your nose is if your mask is leaky and water collects at the bottom of the mask, right where your nose is! That is why they emphasize you get a correct-fitting mask which is easily tested (in the shop) by pressing it on your face without using the strap, suck in a bit with your nose, and see if it stays on.