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Travel back in your memory to your last trip on the Underground. How many people did you see on the platforms? How many on the carriages?
You probably don't remember. Why should you, anyway? Counting people you spot isn't exactly an ordinary pastime. But even if it were, totting up the figures would be a near impossible task, so busy is the tube.
Photographer Victoria Louise Howard set out to capture the network in a different light, completely deserted. Over a couple of of years she visited each of London's 270 stations and snapped a moment without a soul in sight. This regularly meant 3am starts for Howard, necessary to capture a moment of solace at London's most crowded stations.
The resulting photos have been collected in a new book, Unfamiliar Underground. You can see a selection of some of our favourite images below.