The beaver brothers decide to head down to the bottom of the pond in a submarine they had created, though what they discover down there shocks them.
- In the episode, Daggett says what if they're attacked by the Swedish Navy. Sweden is a neutral country so they wouldn't really attack.
- Das Boot - The episode is a take-off of the title of the 1981 German epic war film.
- 20,000 Leagues Under the Sea - The submarine Norbulus is a spoof of the Nautilus from the sci-fi novel written by Jules Verne.
- Mariana Trench - The Norbianus Trench is a spoof of the alternate name Marianas Trench.