Editing Tunnel

{{image|more=yes|Images of the remake}}
{{redirect|Underground Tunnel|stage 4-1 of ''[[Dance Dance Revolution: Mario Mix]]''|[[Frozen Pipes]]}}
{{location infobox
|image=[[File:M&LBIS Tunnel.png|256px]]
|greater_location=[[Mushroom Kingdom]]
|inhabitants=[[Choomba]]s, and [[Coalbit]]s
|first_appearance=''[[Mario & Luigi: Bowser's Inside Story]]'' ([[List of games by date#2009|2009]])
|latest_appearance=''[[Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey]]'' ([[List of games by date#2018|2018]])
}}
[[File:Tunnel Map.png|thumb|left|Map]]{{M&LBIS map}}
The '''Tunnel''' (also known as the '''Underground Tunnel''')<ref>{{cite|author=Browne, Catherine|language=en-us|title=''Mario & Luigi: Bowser's Inside Story'' PRIMA Official Game Guide|page=71|date=September 14, 2009|publisher=[[Prima Games]]|isbn=978-0-307-46565-8}}</ref> is a location in ''[[Mario & Luigi: Bowser's Inside Story]]'' and its [[Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey|remake]]. It is located beneath [[Cavi Cape]] and located south-east of the [[Toad Town Caves]]. [[Bowser]] is catapulted here by a group of [[Bob-omb]]s 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.

The Mario Bros. are unable to access the Tunnel, as it requires breaking rocks and pushing buttons, which only Bowser can do.

The background music in the Tunnel is a slow and sombre composition, which is also used for the Toad Town Caves, [[Tower of Yikk]], and [[Bowser Path]].

A [[Chakroad]] can be found here, hidden beneath a wooden crate near a [[Warp Pipe]] that leads to the entrance of the area.

==Enemies==
*[[Choomba]]
*[[Coalbit]]

==Items==
{|class=wikitable style="text-align:center"
!Item
!Icon
!Location
|-
|[[Supersyrup Jar]]
|[[File:Syrup BiS.png]]
|align=left|In a brick in the southern scene of the west area.
|-
|[[Cheap Ring]]
|[[File:MLRPG3 C Ring.png]]
|align=left|In a brick in the big room beyond the middle or the rightmost crack in the east area.
|-
|[[Rock Shell]]
|[[File:MLRPG3 C Koura.png]]
|align=left|In a brick in the room beyond the leftmost crack in the east area.
|-
|[[Special Fangs]]
|[[File:MLRPG3 C Fang.png]]
|align=left|In a brick in the southwesternmost scene of the west area.
|-
|[[Blitty]]
|[[File:BlittyMLBiS alt.png]]
|align=left|From [[Choomba]]s.
|}

==Media==
{{media table
|file1=M&LBIS The Path of Secrets.oga
|title1=The Path of Secrets
|description1=Plays at [[Bowser Path]], the Tunnel, [[Toad Town Caves]], and the [[Tower of Yikk]] in the original game.

|file2=M&LBIS The Path of Secrets (Inside Bowser).oga
|title2={{Conjectural|The Path of Secrets (Inside Bowser)}}
|description2=Plays at Bowser Path, the Tunnel, Toad Town Caves, the Tower of Yikk while inside Bowser, and during the first visit to the [[Trash Pit]], in the original game.

|file3=M&LBIS+BJJ The Path of Secrets.oga
|title3=The Path of Secrets DX
|description3=Plays at Bowser Path, the Tunnel, Toad Town Caves, and the Tower of Yikk in the remake.

|file4=M&LBIS+BJJ The Path of Secrets (Inside Bowser).oga
|title4={{Conjectural|The Path of Secrets DX (Inside Bowser)}}
|description4=Plays at Bowser Path, the Tunnel, Toad Town Caves, the Tower of Yikk while inside Bowser, and during the first visit to the [[Trash Pit]], in the remake.
}}

==Map==
{{wide image|ML-BIS-map-Tunnels.png|800}}

==Prima Official Game Guide description==
*"''The explosion in Bowser's Castle sends Bowser flying across the kingdom, dropping him into a hole in the ground at Cavi Cape. Bowser pulls himself up to discover he's inside a network of tunnels that have not yet been completely connected. The tunnel system beneath the kingdom is his best bet for finding a way back up to the surface, so Bowser continues exploring.''"

==Names in other languages==
{{foreign names
|Jpn=地下トンネル
|JpnR=Chika Tonneru
|JpnM=Underground Tunnel
|Fre=Tunnel Souterrain
|FreM=Underground Tunnel
|Spa= Túnel Subterráneo
|SpaM= Underground Tunnel
|Ger=Tunnel
|Ita=Tunnel sotterraneo 
|ItaM=Underground tunnel; shared with [[Frozen Pipes|Underground Tunnel]]
|Kor=지하 터널
|KorR=Jiha Teoneol
|KorM=Underground Tunnel
}}

==References==
<references/>

{{M&LBIS}}
[[Category:Underground areas]]
[[Category:Mario & Luigi: Bowser's Inside Story locations]]
[[it:Tunnel Sotterraneo]]