|First appearance||Mario & Luigi: Bowser's Inside Story (2009)|
|Latest appearance||Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey (2018)|
|Greater location||Mushroom Kingdom|
|Inhabitants||Choombas, and Coalbits|
The Tunnel (also known as the Underground Tunnel) is a location in Mario & Luigi: Bowser's Inside Story. It is located beneath Cavi Cape and located south-east of the Toad Town Caves. Bowser is catapulted here by a group of Bob-ombs shortly after Fawful kidnaps Princess Peach. Only two types of enemies appear here.
The area appears to be an abandoned underground railroad. After navigating the tunnels, Bowser meets up with the Monty Bros. One of the four explains that they are trying to make a tunnel that will connect them to Toad Town. They use a huge machine to get the job done. A disgruntled Bowser relunctantly helps them achieve their goal. Mario and Luigi have to go to the Leg Outpost to give him power, though. Bowser has to achieve this before the battery dies in ninety seconds, in order to avoid having to pay 50 coins for a replacement battery. Bowser's power overcomes the challenge and the machine is totaled. Bowser heads in the next room to the Toad Town Caves, where the Dark Star is sealed.
In-field items found in this area include:
|Supersyrup Jar||In a brick in the southern scene of the west area.|
|Cheap Ring||In a brick in the big room beyond the middle or the rightmost crack in the east area.|
|Rock Shell||In a brick in the room beyond the leftmost crack in the east area.|
|Special Fangs||In a brick in the southwesternmost scene of the west area.|
Names in other languages
|French||Tunnel Souterrain||Underground Tunnel|
|Italian||Tunnel sotterraneo||Underground tunnel|
|Spanish||Túnel Subterráneo||Underground Tunnel|
- abcd9146 (December 30, 2009). Mario & Luigi: Bowser's Inside Story FAQ/Walkthrough. GameFAQs. Retrieved June 10, 2016.