Confusing Mystery

This hole appeared in Lake Berryessa last year and others were as astonished as Evan when they discovered this. No one knew how it could happen. Where was the water down the hole flowing to? Evan being a little bit of a geek took it upon himself to solve the mystery of the hole in the Lake. He decided to come up with a plan to know the reason behind the sudden appearance of an abyss. The video ahead records it all and what was eventually discovered.