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45-year-old Liz Kenworthy straightens her jacket as she waits for her train to arrive.

Liz is a liaison officer for London's Metropolitan Police and today she's due to speak with students at a local school, but she's running late, so she positions herself right at the edge of the subway platform hoping to be the first under the train.

A familiar safety announcement floats over the PA system and then Liz gets on board and holds on to one of the overhead handrails.

The door is shut behind her and the train moves off with a jolt.

There are only a few passengers in the car with her.

Juan is a man in his 60s leaning sleepily against a window.

Another is a young woman listening to music through her iPod, but they haven't gone far

when there's an ear splitting noise and the train comes to a shuddering hole.

Black soot and smoke fills the air.

Liz thinks they must have hit something or maybe the train's derail.

But then when she hears the cries for help from the cars near the front, her training kicks in.

By the faint glow of emergency lighting, Liz makes her way to the next car.

The smoke is thicker here, the passengers seem days, some are injured in The her police identification as reassurance as she heads down the train into the forward cars.

Lighting flickers on and off and Liz squins through the black smoke.

What she does see is hard to believe. The train car has been ripped apart,

and amid the wreckage of twisted and shattered glass,

Liz can see motionless bloody bodies.

But there are some people who are still alive, moaning or screaming for help.

...