"Sand," thought Thor. "Mile after mile of silicon dioxide."
"Drop down. Go through the sand."
Grayish granules all around him, bringing the sensation of suffocation until he grew used to it. The gray darkened and grew black as pitch.
"Rock," whispered the Discoverer. "Be cautious, now."
They slid from the blackness into the green light. This was a cave, seemingly endless. Embedded into walls and sides, glittering and sparkling, were bits of onyx, carnelian, opal and amethyst. Thor caught his breath at the iridescent wonder of the jewelled cavern.
"Far off, Thor, to the right. Look there."
Brilliant green fire, rising and falling. Alive, and waiting.
"Aava!"
"Careful. Think not so harshly. He will be aware of you. Come. It is time to go."
They went back, high into space.