In the original Pirates of the Caribbean, Captain Jack Sparrow and Will Turner escape Port Royal by strolling out to an anchored ship. They do this by walking on the seafloor, using an upside-down rowboat to hold air so they can breathe. It’s an awesome scene, but is it, er, possible? Could you do this yourself?
Of course, the great thing about movies is that they don’t need to be realistic (and the Pirates franchise makes the most of that exemption). I’m only asking about this because it’s a fun way to do some physics and understand how the world works. So grab your goggles and let’s plunge in!
What Floats
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