Improvised materials in naval damage control

What was the most unusual material used for wartime naval damage control?

There is no single winner, but condoms, coat hangers, and pencils all had practical sealing, waterproofing, and repair uses aboard ships.

The panel avoids naming a single strangest damage-control material because warships have improvised with a wide range of ordinary objects. Condoms could seal pipes, protect gun mechanisms during river crossings, or keep components of naval mines dry. Coat hangers and pencils offered wire, plugs, wedges, and other shapes that could be adapted during an emergency. The humor surrounding these items should not obscure the engineering logic: damage control values availability, flexibility, and speed more than elegance. A mundane object can become critical when it stops water, preserves a firing mechanism, or keeps an electrical component dry.