Chapel Tunnel is a room in Phendrana Drifts in Metroid Prime. It is a passage for the Morph Ball, with two pillars obstructing it. These can be passed by destroying lower sections of each with bombs; Samus can reach these by destroying boxes to fall down, each of which requires two bombs. After doing this, the far door can be reached.
The Ice Chapel theme plays in this room, continuing from the Chozo Ice Temple into the Chapel of the Elders.