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Thames Barrier - Gate 5

Protecting London from extremely high tides, the Thames Barrier is one of the largest movable flood barriers in the world.
Opened in 1984 by the Queen, the barrier divides the river into a number of sections, with four 200 foot sections for navigation. Semi-circular gates swing up from the river bed between the piers when the barrier is raised.
Things went pear-shaped in 1997 when a dredger collided with one of the piers and sank, leaving London prone to flood. Luckily things were sorted out before the barrier was needed to be raised.

EnglandLondonUKdefensesflood barrierriver thamesthames barriertilt shift