Koonalda Cave security to be improved after Indigenous art vandalised

The Koonalda Cave contains archaeological deposits that are more than 22,000 thousand years old. (Supplied: Department of Environment and Water)

The federal government has announced $400,000 in funding to improve the security of the Koonalda Cave in the Nullarbor Wilderness Protection Area.

Last December, vandals dug under a steel gate, entered the caves, and destroyed Aboriginal rock art by scrawling "don't look now, but this is a death cave" on the walls.