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?

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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