Has anybody heard of swimming through the secondary hole of the blue grotto in Capri? It is the primary light source that makes the cave blue.
In 1989 I swam through the secondary tunnel and practically got myself killed. I've googled it a number of times trying to find out the depth and length of the tunnel, but thus far haven't found anything. I hesitate mentioning this because I don't want to give anybody a bad idea - don't try it!
Any info? What a beautiful place; I would like to know more.