Now this is a PR stunt! Disney recently did an epic event for the launch of Disney-Pixar’s film ‘UP.’ The Tower Bridge opened up to make way for a giant hot air balloon (which appeared to be thousands of balloons all together).
According to Cakehead Loves Evil, there were 500 mini balloons woven together with 18 miles of thread to create the contraption which sailed through the famous bridge. There couldn’t have been a more perfect stunt to launch Disney-Pixar’s film ‘UP.’
The Tower Bridge Interrupted by Disney-Pixar's 'UP' Film Stunt
Shelby Lee Walsh — October 3, 2009 — Pop Culture
References: cakeheadlovesevil.wordpress & notcot.org