Could You Use a Rowboat to Walk on the Seafloor Like Jack Sparrow?

In Pirates of the Caribbean, Jack and Will use an overturned dinghy to hold air underwater. Madness or brilliance?
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What are the tiny holes on the sides of my phone for?

On iPhones with physical SIM cards, this slot is on the side. You’ll notice a small panel with a tiny hole in it. If you push ...