How should a large hole in the side of a ship be patched?

Using a mattress with a table outside as a method to patch a large hole in the side of a ship is not a conventional or effective solution. A proper patching method requires materials and techniques that can withstand the forces exerted on a ship's structure and maintain the integrity of the hull under various conditions, including pressure and motion.

The correct approach for patching a large hole would realistically involve robust materials such as steel plates that can be welded or bolted in place to ensure a strong and lasting seal. Steel plates provide the necessary strength and durability, while welding offers a seamless connection that can be vital in maintaining the ship's integrity. Additionally, drilling and bolting a patch is a viable short-term solution that can be employed in emergency situations.

Therefore, while using a mattress may seem feasible in a non-technical sense, it would ultimately fail to provide the safety and structural support needed for a vessel, making it an unsuitable choice compared to more reliable and accepted engineering practices.