The Underground Diner is a room in Club Penguin Island, located underneath Island Central. It first opened during the Summer Splashdown and then it was closed until Halloween 2018. It was confirmed that it would be kept permanently. It is a restaurant that includes several booths, a counter, and the Inflatable Octopus. Players can also use the Vending Machine here.
- Main article: Gear
- The following non-portable gear can be used here.
Quick Chat messages
- Main article: Quick Chat
- The following location-specific Quick Chat messages can be used here only during the Summer Splashdown.
- Can I help you?
- Right this way
- What can I get for you?
- One pizza coming up!
- Can I speak to the manager?
- What a strange place for a diner
- Looks like Franky's got competition
- What an incredible smell you've discovered
- Main article: Club Penguin Island/Music
| Name || Soundtrack
| SummerSplash2018 EXTREME DoigtsAgiles ||
| SummerSplash2018 EXTREME LaRueDrude ||
| SummerSplash2018 EXTREME LeParcDePlaisir ||
| SummerSplash2018 EXTREME LesTempsDesCeries ||
| SummerSplash2018 FrenchAvenue ||