DSV Alvin

United States Navy’s deep ocean research submersible ‘DSV Alvin’ is a ship of Theseus. Every component of this vehicle has been replaced since it entered service in 1964. It has been used to explore hydrothermal vents, the Titanic, and the Deepwater Horizon oil spill. It was once even attacked by a swordfish. The fish was later cooked and eaten.