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Aired (October 19, 2025): Discover the secrets of the world's deepest canyon! Kuya Chris Tiu and Shaira Diaz explain how these giant landforms are made and tell us which one is the deepest of them all.

Watch 'iBilib' Sundays at 9:35 AM on GMA Network, hosted by Chris Tiu and Shaira Diaz.

For more iBilib Highlights, click the link below:

https://www.youtube.com/playlist?list=PLLYaldfT7P2Teh_NQfZBAjzvRkaF0KZuw