Someone coughed. Green was about to caution them to keep quiet, when he felt his nostrils tickling and had to fight to down a loud sneeze himself.

"Dust."

"Good," said Green. "Maybe they never come down here."

Suddenly the tunnel turned at right angles, to the left. The little light that penetrated from the entrance disappeared in total blackness. The party halted.

"What if there are traps set for intruders?" wailed Inzax.

"That's a chance well have to take," Green growled. "We'll go in the dark until we come to another turn. Then we'll light up a torch or two. The natives won't be able to see the glow."

He walked ahead feeling the wall with his left hand. Suddenly he stopped. Amra bumped into him.

"What is it?" she asked anxiously.

"The rock wall has now become metal. Feel here."

He guided her hand.