Is it ok to build a cardboard boat with a small pocket of air

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How to build a cardboard boat for Racine Cardboard Boat Race

How would you turn an ordinary ship/boat into a hydrofoil? What materials would be needed for such a project? - Quora

What are some things you can do with an old boat hull? - Quora

Should you build a cardboard box that will float like those emergency life rafts, or just buy one if you ever get into trouble on the ocean or lake? - Quora

What is the best wood boat? - Quora

FLEXTAILGEAR Portable MAX Boat Pump Rechargeable

How to build a cardboard boat for Racine Cardboard Boat Race

Where can I find DIY cardboard craft houses? - Quora

How to Build a Cardboard Boat: Easy and Simple Design