The footage was probably taken from the very large-scale drill that occurred in Manchester in May, 2016. It was mentioned earlier in the thread, but looking further into it, it's clear that they put huge resources on it, even having actors trained by a psychologist so they would react properly.
CrisisCast was founded by Hunt and Brian Mitchell – both are actors and have worked in film production, and brought this knowledge to disaster and crisis management training. They can create a 20-car pile-up, or recreate an incident in a nuclear power station; later this year they will be staging a plane crash at an airport, complete with wrecked fuselage, to test the capabilities of the airport fire service. They use smoke, prosthetics and medically trained makeup artists who, says Mitchell, “know what a bullet hole really looks like, and the colour of blood. On some exercises you’ll see very pink blood, but blood is more coffee-coloured. It’s dark when it comes out.”
Their 400 actors have also been trained by a psychologist so they know how they should react in a traumatic situation. “It’s not what we call jazz-hands acting,” says Hunt. “It’s not about trying to do a big show and doing a great Lady Macbeth bit – ‘Oh my god, I’ve got blood on my hands.’ It’s to do with making sure the person you’re dealing with gets caught in the realism.”
And it is very real, says another member of the team, Mick Massey, who spent 30 years with the London fire brigade.
“It’s as real as you can get without it actually happening,” he says. “It’s about developing muscle memory. The only way, sadly, I learned that was from real incidents.” As a young fireman, his first major incident was the blast at the Olympia exhibition centre in west London in 1976, blamed on a breakaway IRA group; he was also at the 7/7 attacks and the Paddington rail disaster. “The more realism you put in, the more comfortable you feel – if you can feel comfortable – when it happens for real.”
https://www.theguardian.com/uk-news/201 ... ster-drill