How had Dalis learned the secret sign-manual of Jaska and Sarka?

Sarka could feel new life being borne in him, could feel himself revitalized, exalted, lifted to the heights.

Another evidence of the fact that Sarka had not always trusted her, for she knew nothing of a secret exit dome.

Sarka, smiling slightly, pushed the lever to its uttermost limit, still with his right arm upraised.