Whomp's Fortress Interior

the Whomp's Fortress Interior is an alleged area in Super Mario 64, found in the Whomp's Fortress course. Several have reported accessing this area, though all reports appear to be different. Many agree that it is a sub-area similar to Tall, Tall Mountain's hidden slide, though it does not have a mission assigned to it.

Interpretations
''Everything in this section should be taken with a grain of salt. These are all unverified claims.''"Read: Whomp's Fortress Interior/Weirdwierdweirdo's Interpretation and Whomp's Fortress/The Fortress' Dungeon Interpretation"