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The Underground Tunnel is a room in Torvus Bog. This tunnel is submerged, unlike most other rooms in the upper level of Torvus Bog.
The tunnel connects the Torvus Temple, by a Blue Door, to the Torvus Grove, by a White Hatch.
A small waterfall is found within the tunnel. On the other side is an entry of Luminoth Lore. Several creatures inhabit this small passageway. Also, a Missile Expansion can be found via a Morph Ball tunnel under a platform.