Perhaps you're as curious as I am, but how could a 10-story, 45-ton structure get to the top of the Bird's Nest during the opening ceremonies without a hint of where it came from. Here's what I've learned.
The secrecy of the cauldron became a top priority. Look at the photo above and you'll see a 30-meter, air-cushioned tunnel set on top of the roof that kept the cauldron under wraps for almost two months. A rail system was created to move the giant cauldron to the edge of the stadium and down into position. So while you and I and everyone else were watching the parade of athletes, a button was pushed and it took about 16 minutes for the cauldron to move into position surprising everyone. The inflatable tunnel disappeared and no one was the wiser. The whole system and Cauldron weighed about 405 tons and cost about $1.5 million dollars.
This photos shows the day when the cauldron was inserted into the inflatable tunnel. Now you know. :-)