Crossway Access West is a room in the Chozo Ruins in Metroid Prime. It is a long tunnel featuring numerous small holes with beams of light pouring through, and rubble at the end with a hole small enough to squeeze the Morph Ball through.
A glitch can happen in this room in the original NTSC version of Metroid Prime, as it uses the original, faster loader. The game occasionally crashes while the game is loading the Furnace. This bug can be avoided by using a Wii.