The cave is over 100.000 years old. It was formed earth faults and has suffered ice ages and tropical heat waves.

At the present time, it is almost fossilised, except for the deepest galleries, where the dripping still forms stalactites.

The cavity known as Can Marsa was discovered by smugglers, who used it for hiding their goods, hoisting them from the sea from an opening located at a height of 8/10 metres.

It is still possible to see, to-day, the red or black paint marks signposting another way out in case of flight or emergency.