What you'll never see is the unglorious task of performing the mundane and laborious preventive maintenance tasks related to submarining! We would never get volunteers if that were advertised!!! The deck guns were made of non-corroding materials for the most part, and had lots of grease applied to their moving parts. A lot of time was spent inport to clean, preserve, and lubricate those guns to ensure
proper functioning when needed at sea. US 5"/25 guns had stainless steel for major components, as well as copper-nickel alloy and bronze parts. Plus, the paint. You can never have too much paint!!!
"If you ignore the problem long enough, it will go away. Even flooding stops eventually!"