Spokesman Morgan Warthin said: “Every opportunity like this, every training opportunity reveals both where our strengths are.

“But also how we can improve.”

Mr Warthin knows that emergency services will need to be absolutely prepared if a catastrophe strikes near Mammoth in Yellowstone National Park.

The exercise took place on a discreet road behind employee housing in order to minimise local disturbance, while the simulation was underway.

The Yellowstone spokesman also discussed the challenges his team will face if there is a supervolcanic eruption at Yellowstone.

He said: “You know, the number one challenge is we are remote, so it takes a while to get to Yellowstone.”

When the test run began, responders from eight different agencies inside and outside the park dealt with the situation well.

This encouraged all involved in the simulation, as there is rarely any telling when Yellowstone might erupt.

In fact experts at Yellowstone National Park claim to have seen the Steamboat Geyser erupt last month.

The park service made the announcement about the world’s tallest active geyser in March, as geologists compared the accounts to thermal sensors in the area.