On this was mounted a small medium-crystal unit. Such a transmitter was standard lifeboat equipment, but this set’s crystal had been recharged, removing it from the universal distress medium, and matched to only one other unit, which was in the interstellar ship now resting on Hekla’s innermost satellite. The set was keyed, as the high-frequency interrupter which permitted voice and, later, vision to be sent and received even by a ship in second-order flight had not at that time been developed.

Vickers checked the tiny green light which assured him that heat or stray static charges had not altered the crystal’s medium; then, at a very fair speed, he began rapping out a message. He had to wait several minutes for an acknowledgment, but finally a brief series of long and short flashes blinked from a second bulb above the key, and he closed the unit, satisfied.

There was nothing more he could do at the moment. He had been active since mid-morning, and it was now well after noon; he suddenly realized that his legs and back were aching fiercely from the unaccustomed walking under Heklan gravity. Vickers rose, closed and secured the inner air lock door, and dropped thankfully onto his bunk.

When he awoke, the sun was quite low in the west. Its enormous disk, ill-defined at the best of times, was nearly hidden in haze; the western half of the sky was tinted a deep blood-red never approached by a terrestrial sunset. The daily cumulus cloud was still above the mountain, its top streaming away inland and forming a crimson-lit finger pointing at Observatory Hill. Vickers, looking at it, was reminded to turn on the homing transmitter in his ship, in case his help should have difficulty in locating him.

He spent more than an hour at the board, using all his radio equipment in every combination and on every band he could reach, in an effort to pick up Heklan communications.