How did a single fire bring down Europe’s busiest airport?

It seems astounding that a single fire at an electricity source shut down one of the world’s busiest airports.
The disruption to the journeys of thousands of passengers and millions of tonnes of trade goods on Friday has prompted a series of questions over the resilience of the UK’s major infrastructure.
Disaster recovery plans keep the top brass of many organisations awake at night.
Banks, data centres, stock exchanges, hospitals, all have contingency plans.
“How is it that critical infrastructure – of national and global importance – is totally dependent on a single power source without an alternative?”, said Willie Walsh, the director general of the International Air Transport Association, which represents airlines.

Courtesy: BBC