Stop Sinking With Onboard Materials

Use materials from your boat to keep it from sinking.

Hammer or kick pieces of fiberglass back into place, being careful not to cut yourself.
Make a seal. We used a piece of an unneeded life jacket. Foam from mattresses or cushions or folded beach towels work well.
Cover that patch with something stiff. We pried a door from its galley cabinet. Hatch covers beneath seat cushions work. Wedge it in place. We used a short telescoping brush handle turned diagonally inside the compartment. A long boat hook might wedge against the underside of the deck or cabin overhead. Be creative.