The Submarine is a large submarine that was used by SpongeBob and Patrick to get the reed back out of Squidward. It only had one appearance so far. At the end of the episode Patrick accidentally turns the Submarine back to large size and SpongeBob and Patrick are stuck in the Submarine in Squidward. In Hide and Then What Happens?, the submarine looks very different. It's possible it's a different submarine. In Bubble Troubles the submarine is red and is much wider.
 People who used it
- In each of it's appearances, the submarine keeps changing from one look to another.
- In Bubble Troubles, Sandy used it by sitting in the back seat.