No special access issues
At the moment the access is only possible by boat, which takes approx. 10mins. from Cala Gonone. However, the alternative access by via ferrata is planned to be constructed in the near future.
It is also possible to reach the cave from Millennium cave. Go to millennium cave and at the end of the via feratta, keepgoing down towards the sea instead of going to Millennium. Once low enough, traverse by the sea until you reach Colombei. This approach is rather adventurous.