Mythbusters (Discovery Channel) raised a monohull sailboat (something like 25' in length) using a semi-truck load of ping pong balls. They devised an elevated funnel in which they poured water and ping pong balls. They had to put plywood over the hatches because a hatch opened on them and let most of the balls out on the first attempt.

But in all seriousness, the likely solution is to dive on the boat and inflate bags with air from a compressor on surface or air from diving tanks. Once the boat is at the breaching the surface, you will need a high flow rate pump to begin evacuating the water from inside the boat.