ALG-454, Derrick Arch, Ti-Spad Area. Both openings estimated at 8 meters high. This amazing double arch is located in the deepest area of Ti-Spad. In this labyrinth formed by many interwining deep corridors, directions cannot be described and GPS does not track any satellite positions, so the visitor will need to take a lot of time to explore this area to find this arch and the two following entries.

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