"Having this national training centre is a real asset for us as it gives recruits a chance to appreciate what they will be faced with in the real world.
"It helps the recruits develop their teamwork, decision-making and response times. It's all about putting into practice the skills they have been learning over the last 11 weeks."
St John clinical support officer Adam Rayner said the hands-on training was "absolutely critical" for new recruits.
"After the scenario we will debrief the trainees and talk to them about what went well and what could be done better - this is the place for them to make mistakes and see how to improve.
"We get actors in so it's not like the people are smiling and chatting away, they become less responsive the longer it takes to get them treated, they are swearing, screaming and crying as real patients do in these situations."
Trainee Bryce Miller said the exercise was an eye-opener.
"You see emergency scenes on movies and TV shows so this training scenario wasn't too shocking for me but it goes a long way to preparing us for the real world.
"Being a firefighter was a childhood dream of mine and taking part in this experience is a good way to learn a bit more about what we can expect when we finish our training."
- To see video of the scenario being played out, go to www.dailypost.co.nz.