This video says about itself:
12 October 2016
Three wild Asian elephants, two adults and a baby, were trapped in a reservoir in southwest China’s Yunnan Province for more than two days, which may cause them to choke on the water and die from hunger.
Rescuers tried many ways and finally managed to save these endangered animals on Tuesday by digging out a path from one side of the pond.
Dutch NOS TV writes today about this (translated):
Over two days, they were stuck in a five-meter deep tank: two wild adult elephants and a baby elephant. Foresters found the animals in south[western] China after getting information from locals, but could not immediately launch a rescue operation because of heavy rains.
Probably the baby elephant first fell in a tank full of water and its parents then fell in a rescue attempt. Images on Chinese state TV show how other elephants ran around the edge of the reservoir. In order to save the trapped animals, the other elephants first had to be driven away with firecrackers.
Eventually, rescue workers with a backhoe demolished the wall of the tank, and the elephants could get out.