Re: This is well beyond my knowledge and experience but....
I used to work a place where one of the labs went more exothermic than desired... Some people had to change into special clothing to perform their role.
Everyone got out quickly and safely and then over ten fire engines showed up and the fire was soon out. People were waiting in the canteen and but they weren't allowed back in until they'd proven it was safe (which ended up taking days). Those people in the specialist gear didn't have their keys with them which meant they couldn't get home. In the end I think the site head ended up going to the bank and giving people money.
One other thing that wasn't planned for was that all the senior people who were handling the mess were making a huge number of calls on their mobile phones which soon ran low on battery. Round about this time the managers went from Nokia bricks that lasted over a week to smart phones; no one had thought to add phone chargers to the room used to coordinate emergency responses.