A hot air balloon has flown underneath London's iconic Tower Bridge in an elaborate marketing stunt.
Drivers attempting to cross the Thames were surprised to see the huge balloon tied to a boat making its way under the raised bridge in a promotion for new Pixar animated film Up.
To recreate the computer-generated fantasy — in which an elderly balloon salesman's house floats across the globe — 500 small balloons were woven onto the main inflatable as the rainbow spectacle floated between the famous pillars.
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