Which of the following 'grottoes' was a sacred sanctuary of Tiberius?

I visited the Blue Grotto back in the seventies. We glided into the cave on a narrow flat boat and had to duck down to enter through the small opening. Inside the cave was pitch black but the water was iridescent blue. Truly a site to see.

Going this year in may

Wanted to see that since I was a child. 💙

captainpokeymunky568, perhaps they meant 60 meters not miles.

Too many typos to mention!

Oliver Twist, that math is easy off ether way

Player #4361818, Me too.

captainpokeymunky568, that must be 30 meters?

Player #4361818, I would, absolutely, love to see, this work of greatness!!

Player #4361818, i have...the water is an torquoise...to go inside , you sit on a flat bottom boat, and at the entrance everyone lrans backward..it is not very high. The guys who row you in start singing. The acoustics are incredible!