We chose to use the entrance which allowed for breathing. Standing above the ladder I felt heaving gusts and vacuums as the ocean's surge exhaled cold, dark air, then sucked it back in. After crawling on our hands and stomachs for ten minutes in complete darkness, we came to the chasm. It's as big as a movie theater, and the only light comes from the sun shining through the ocean then radiating back up, making the inside a supernatural blue-green. Bill had warned us not to swim through the underwater passageway that leads out of the cave.
Every year tourists drown.
They get halfway, chicken out, and decide to turn around, then they end up in one of the other caves that has no air inside, only water. I timidly poked the glowing water with my toe. I put my head underwater with a mask on and saw a million tropical fish encapsulated in a black rock tunnel. The sun radiating through the sea was a complete contrast to the darkness of inner earth. Inside the cave were two men who had been making good progress on a bottle and a twelve pack.