The character is just floating in the middle of a large body of water; so large that said character cannot see any shores. How did they get there?

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I woke up to find myself lying on a piece of driftwood in the middle of what seemed like an ocean. I didn't know how long I'd been there, or even how I got there. All I knew was that I needed to get to shore somehow. I need to warn them. People are in danger. They are coming.

If you want to use this prompt, here are my three rules:

1: Please give credit to me for the idea.

2. Please do not copy it word for word in your story. Make it your own!

3. Please tag me when you publish it. I would like to read it!