Dramatic cliff rescues and underwater searches took place in Ystradfellte in the Brecon Beacons National Park on Sunday - but only for show.
Members of the public were invited to watch the event
It was part of a safety campaign launched by the Waterfalls Safety Advisory Group (WASAG) to warn Walkers to take extra care around water.
A soldier drowned during a training exercise in a cave at Porth-yr-Ogof near Ystradfellte in 2002.
Rescue experts hope publicity will help avoid further tragedies.
WASAG is made up of organisations like the Forestry Commission, Dyfed-Powys Police, mountain and cave rescue teams, and members of the local communities.
Also taking part in Sunday's event were members of the South Wales Police underwater search team, South Wales Search and Rescue Dogs, Wales Ambulance Service, and RAF - who were providing a helicopter to fly "victims" to safety.
Various scenarios were planned to take place, including cliff rescues, searches using dogs and underwater teams, and helicopter air-lifts.
Waterfalls can be beautiful but deadly
"We have planned this training day for months," said National Parks warden Jon Pimm.
"It's the perfect opportunity to raise public awareness to the dangers of waterfalls, and to give an insight into the work of the emergency services within the Brecon Beacons National Park.
"Too often, we hear tragic stories surrounding waterfalls around the country and hopefully this training exercise will provide the public with more information about how to enjoy the area safely."
Forestry Commission Area Manager, John Williams, added: "We want visitors to enjoy the beauty of our waterfalls without coming into any danger and to feel safe in the knowledge that our safety and emergency teams are on call 24 hours a day."