A six-day emergency search and rescue exercise described as the world's largest event of its kind is being run in Hampshire.
The operation - a simulation of an earthquake in an overseas country involving a British Embassy - is being run from Fort Widley near Portsmouth.
It is overseen by a team from the UN, which will look at how countries could co-operate better after an earthquake.
It involves 100 fire staff, police, and 24 VIP guests from nine countries.
Three US search and rescue teams, from Los Angeles and New York, will contribute their experience of the 11 September emergency operation and West Coast earthquakes.
Hampshire Fire and Rescue Service said the event, which runs until Friday, is the largest event of its kind in the world.