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BlackRock Investment Management UK Limited.

Authorised and regulated by the Financial Conduct Authority.

It's just past 5 p.m. on April 29, 1903, in a coal mine beneath Frank, a small town in Alberta, Canada.

Time is running out for miner Dan McKenzie. In near total darkness, he swings his pickaxe against the wall, trying to clear a path to freedom. Thirteen hours ago, Dan's shift underground was interrupted by what sounded and felt like an earthquake.

He raced to the mine entrance only to find it buried under tons of rock.

Then the tunnels around him began filling with water.

Now the oxygen is running out too, and Dan and 16 other miners are trapped in a desperate

race to save themselves before they suffocate or drown.

Dan takes a short, shallow breath and swings again, aiming for the softer coal scene.

It's easier to break than the surrounding limestone, and every second counts now. But his arms are

trembling, and his strength is almost gone. Still, he manages to raise the pickaxe one more time.

The blade bites deep into the wall. He twists the handle,

wrenching it from side to side, until suddenly the wall gives way. Daylight floods the tunnel

and fresh air rushes through the opening. The miners surged forward, clapping Dan on the

shoulder. They all think their ordeal is

over, but none of them knows what waits outside. After 13 hours underground, Dan McKenzie and the

...