Dalgard summoned up his last rags of energy and coursed after him. Sssuri had halted before a dark lump which protruded from the side of the corridor.
"A sea lock!" Sssuri's claws were clicking over the surface of the hatch, seeking the secret of its latch.
Panting, Dalgard leaned against the opposite wall. Just as a protest formed in his mind he heard something else, the pad of feet, many feet, echoing down the corridor. And somehow he was able now to look.
Round spots of light, dull, greenish, close to the ground, as if someone had flung a handful of phosphorescence into the dark. But this was no phosphorescence! Eyes! Eyes—he tried to count and knew it was impossible to so reckon the number of the pack that ran mute but ready. Nor could he distinguish more than a very shadowy glimpse of forms which glided close to the ground with an unpleasant sinuosity.
"Ahhhhh!" Again Sssuri's paean of triumph.
There was the grate of unwilling metal forced to move, a puff of air redolent with the sea striking their bodies in chill threat, the brightness of violet light stepped up to a point far beyond the lamps in the corridor.
With it came no rush of drowning water as Dalgard had half expected, and when the merman clambered through the hatch he prepared to follow, well aware that the eyes, and the pattering feet which bore them, were now almost within range.
There was a snarl from the passage, and a black thing sprang at the scout. Without clear sight of what he was fighting, he struck down with his knife and felt it slit flesh. The snarl was a scream of rage as the creature twisted in midair for a second try at him. In that instant Sssuri, leaning halfway out of the hatch, struck in his turn, thrusting his bone knife into shadows which now boiled with life.
Dalgard leaped for the lock door, kicking out swiftly and feeling the toe of his boot contact with a crunch against one of those darting shades, sending it back end over end into the press where its fellows turned snapping upon it. Then Sssuri grabbed at him, bringing him in, and together they slammed the hatch, feeling it shake with the shock of thudding bodies as the pack outside went mad in their frustration.
While the merman fastened the locking bar, bringing out of the long-motionless metal another protesting screech, Dalgard had a chance to look about him. They were in a room some eight or nine feet long, the violet light showing up well tangles of equipment hanging from pegs on the walls, a pile of small cylinders on the floor. At the far end of the chamber was another hatch door, locked with the same type of bar as Sssuri had just lowered to seal the inner one. The merman nodded to it.
"The sea—"
Dalgard slid his knife back into its sheath. So the sea lay beyond. He did not welcome the thought of passing through that door. Like all of his race he could swim—perhaps his feats in the water would have astonished the men of the planet from which his tribe had emigrated. But unlike the mermen, he was not sea-born, nor equipped by nature with a secondary breathing apparatus to make him as free in the world of water as he was on land. Sssuri might crawl through that hatch without fear. For Dalgard it was as big a test as to turn and face what now raged in the corridor on the inner side.
"There is no hope that they will go now," Sssuri answered his vague question. "They are stubborn. And hours—or even days—will mean nothing. Also they can leave a guard there and rove at will, to return upon signal. That is their way."
This left only the sea door. Sssuri padded across the chamber and reached up to free one of the strange objects dangling from the wall pegs. Like all things made of the marvelous substance used by Those Others for any article which might be exposed to the elements, it seemed as perfect as on the day it had first been hung there, though that date might be a hundred or more Astran years earlier. The merman uncoiled a length of thin, flexible piping which joined a two-foot canister with a flat piece of metallic fabric.
"Those Others could not breathe under the water, as you cannot," he explained as he worked deftly and swiftly. "Within my own memory we have trapped their scouts wearing aids such as these so that they might spy upon our safe places. But their last foray was some years ago and at that time we taught them such a lesson that they have not dared to return. Since they are not unlike you in body and since you breathe the same air aboveground, there is no reason why this should not take you out of here."
Dalgard accepted the apparatus. A couple of elastic metal bands fastened the canister to the chest of the wearer. The fabric molded into a perfect, tight face mask as it touched the skin.
Sssuri went to the pile of cylinders. Choosing one he tinkered with its pointed cone, to be rewarded with a thin hiss.
"Ahhhh—" again his recognition of the rightness of things. "These still contain air." He tested two more and then brought all three back to where Dalgard stood, the canister strapped into place, the mask ready in his hand. With infinite care the merman fitted two of the cylinders into the canister and then was forced to set the other aside.
"We could not change them while under water anyway," he explained. "So it will do little good to take extra supplies with us."
Trying not to speculate on the amount of air he could carry in the cylinders, Dalgard fastened on the mask, adjusted the air tube, and sucked. Air flowed—he could breathe! Only—for how long?
Sssuri, seeing that his companion was fully provided for, worked at the bar locking the sea hatch. But in the end it took their combined strength to spring that barrier and win through to a small cubby which was the actual sea lock.
Dalgard knew one moment of resistance as the merman closed the hatch behind them. For an instant it seemed that the dubious safety of the dressing chamber and a faint hope of the hunters' giving up their vigil was better than what might lie before them now. But Sssuri pushed shut the hatch, and Dalgard stood quietly, without offering any visible protest.
He tried to draw even breaths—slowly—as the merman activated the lock. When the water curled in from hidden openings, rising from ankle to calf and then to knee, its chill striking through flesh to bone, he kept to the same stolid waiting, though this seemed almost worse than a sudden gush of water sweeping them out in its embrace.
The liquid swirled about Dalgard's waist now, tugging at his belt, his arrow quiver, tapping on the bottom of the canister which held his precious air supply. His brow, shielded from the wet by its casing, was swallowed up inch by inch.
As the water lapped at his chin, the outer door opened with a slow inward push which suggested that the machinery controlling it had grown sluggish with the years. Sssuri, perfectly at home, darted out as soon as the opening was large enough to afford him an exit. And his thought came back to reassure the more clumsy landsman.
"We are in the shallows—land rises ahead. The roots of an island. There is nothing to fear—" The word ended abruptly in what was like a mental gasp of either astonishment or fear.
Knowing all the menaces which might lie in wait, even in the shallows of the sea, Dalgard drew his knife once more as he plowed through water—ready to rescue or at least to offer what aid he could.
10
THE DEAD GUARDIANS
The spacemen spent a cramped and almost sleepless night. Although in his training on Terra, on his trial trips to Mars and the harsh Lunar valleys, Raf had known weird surroundings and climates, inimical to his kind, he had always been able to rest almost by the exercise of his will. But now, curled in his roll, he was alert to every sound out of the moonless night, finding himself listening—for what he did not know.
Though there were sounds in plenty. The whistling call of some night bird, the distant lap, lap of water which he associated with the river curving through the long-deserted city, the rustle of grass as either the wind or some passing animal disturbed it.