Underground world: Seoul's 'super highway' v London's 'rude tube'

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Getting around big cities can be a frustrating business, but travelling by tube train is usually relatively quick and easy.

The BBC's Underground World series is looking at what it is like to be a commuter around the globe.

Tulip Mazumdar takes a ride on the London tube, which is celebrating its 150th anniversary, while Lucy Williamson hops on the far more recent Seoul underground.

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