We’re back on the fuel dock at Elliott Bay Marina for a dockside conversation about the stuff you don’t see—what’s happening underneath your boat.

We’re joined by Shane McCall of Emerald City Diving, one of Seattle’s go-to dive teams for underwater boat work. Shane breaks down the real-world maintenance schedule for saltwater moorage, what “zincs” actually means (and why anode material matters), how to spot early warning signs like corrosion and “haloing,” and why using your boat more often can actually reduce certain problems.

We also get into props and running gear: what happens when you snag a crab pot or line, whether cutters like Shaft Sharks or Spurs really help, and how divers pull and reinstall props (yes—tight enough) without a haul-out.

If you’ve ever wondered how often you should be diving, w ...