Ok so I was in Cherno looting with a low FPS because my computer is terrible, but I got a hug FPS drop and when it came good I was in the ocean, I've linked pictures showing what it looks like. Now I'm guessing it was my lag that somehow teleported me there but I have no idea what to do now, my steam ID is nexusau if you can reset my character or something.
Cheers.

Pictures: http://imgur.com/a/jPybJ {F28972}