Self-guided tour the submarine responsible for the sinking of more than 30,000 tons of Japanese shipping during WWII. She also performed history's only international sub to sub rescue when she saved the crew of a grounded Dutch submarine in WWII. Cod is a National Historic Landmark and among the finest submarine restorations in the world. Be advised Cod will be unavailable for tours from mid June to late July 2021 due to a shipyard overhaul program.