Here for a moment or two all seemed dazzled, but as their bewildered vision gradually grew accustomed to the light they saw that everything in the grotto, walls, sea, or any objects, appeared of a heavenly blue color.
The faces of their friends, their own hands, the water when they scooped it up and dropped it again, all were turned to sapphire, while articles under the sea gleamed with a beautiful silver shade.

The girls bared their arms and enjoyed dipping them to obtain this effect.

The glorious blue of the cave was indescribable.
"I feel like a mermaid at the bottom of the ocean," exulted Peachy.
"Or a cherub in the sky!" said Jess.
"Why is it blue though ?" asked Lorna.
"Because of the refraction of light," explained Mrs.Beverley from the next boat.

"We see a kind of concentrated reflection of the sky sent to us under the sea.

If it were a gray day outside it would be gray in here too.