Whomever asked the question probably forgot the secret handshake.

They have all openly discussed the previous tunnel that went to Owens Lake, CA. What a disaster. After a spaceship crashed in the water, it was discovered that it was filled with a precious cargo of absorbant material that soaked up the entire lake! After the lake was dry enough to drive on, a crane removed the UFO and moved into a holding cell inside the Hoover Dam. This was a good measure because if the dam collapsed, the UFO and absorbant material would become exposed again and remove the massive ensuing tidal wave to a mere trickle by the time it enters a populated area.