enforce silence.

* * * * *

The girl listened intently, then stole softly out into the corridor
from which she had come. She motioned the men to follow, and pointed
there in the dim light to a far room.

There were others, they saw; a group of young women lying at ease on
their pallets, or moving slowly about. The need for quiet was
apparent, more so when the figure of a man appeared as they watched.
Quickly the girl, Marahna, stepped before them and motioned them back
to their room.

She followed and glanced quickly about. In the farther wall was an
opening, close to the floor, and low, but they managed to work their
way through at her silent command. A passage, much like the others,
lay beyond. It widened and grew higher, until they could stand erect.
Back in the circle of light they saw, for a moment, the man, bowing
low in respect before Marahna. He carried a basket of light that shone
brightly in the room.

"Replenishing the supply of sulphide," whispered Winslow.

A current of air came cool and refreshing from a branching tunnel in
the rock. There was no lack of ventilation, as they well knew,
throughout all the tortuous passages, but this came with a scent of
outdoors that set both men a-tingle with hope. Jerry forgot even the
dull ache in his arm as he breathed deep of this messenger from the
outside.

But exploration must wait. They needed to rest, to learn and to plan.
They returned when Marahna called softly from the room.

* * * * *

Time had lost all its meaning. They could only guess at the hours that
had passed since the hour they left their ship, could only make
unanswered surmises as to where was the sun or how much was left of
the long lunar day. They must escape--they would escape--but their one
stroke for freedom must not be made when darkness and paralyzing cold
should force them back into the hands of the enemy tribes.

Marahna was with them much of the time, and always they struggled and
strove with desperate concentration to grasp at the meanings of the
thoughts she tried to convey. And they learned much.

Of the passage they believed they had found out to the surface, she
knew little. But she showed them, with doubt in her face, that there
was almost hopeless struggle along that path to the freedom above.
Sadly she touched Jerry's injured arm, and she shook her head in
dejection.

The arm had had a bad wrench, Jerry f