Come To Eden II - originalGZ Traditional Cache

Is that a cache I see in the sewer? How do I get to it??! A cache for the more adventurous!

This cache was the original GZ for Come To Eden II GC12ZZ2, but I had decided to split it off as an individual cache, given its difficulty. 

At GZ, you will be able to stand on top of this grate and see the cache hanging inside. Now, how can you get your hands on it?? CLUE: you're going to have to walk around, and down, and run the gauntlet of red ants and black ants, bow and prostrate to gain entry into the 'Tunnel of Death', and pray that you do not disturb any of the guardian wasps, before climbing to the light to claim this cache.

Be careful, and may the interpid succeed!