No, it will only work if the top of it is sticking out of the water so unless its a really long snorkle,,, no
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I don't think you can swim with a snorkel. You should ask an official if it is allowed. I personally wouldn't because the snorkel creates a lot of drag and will slow you down.
A snorkel is just a breathing tube. It carries air down to the person underwater so he can breathe. It has a valve that closes if the air intake at the top goes underwater.