Authorities say 11 people have been rescued after being trapped by a flash flood in a huge bat cave in western Romania.

Alina Marescu, spokeswoman for the local emergency services, told The Associated Press that the group had taken shelter Monday afternoon from torrential rain, only to be trapped by the flood. They were rescued after a seven-hour operation.

She said Tuesday that the group included two experienced speleologists — people who study caves. The others were aged 15-17, of which four were French. Marescu said they were checked by medics and nobody needed medical care.

The Huda lui Papara cave is home to the largest bat colony in Europe, located in the Apuseni Mountains in northwestern Transylvania.