"Hurry, Taylor!" he said. "I've set the switch so that she can do the sending, while we receive. Quickly, man!"

I leaped into the pool and adjusted the antenna on her head, making sure that the four electrodes of the crossed curved members pressed against the front and back and both sides of her head. Then, hastily, I climbed out of the pool, seated myself on its edge, and put on my own antenna.

Perhaps I should say at this time that Mercer's device for conveying thought could do no more than convey what was in the mind of the person sending. Mercer and I could convey actual words and sentences, because we understood each other's language, and by thinking in words, we conveyed our thoughts in words. One received the impression, almost, of having heard actual speech.

We could not communicate with the girl in this fashion, however, for we did not understand her speech. She had to convey her thoughts to us by means of mental pictures which told her story. And this is the story of her pictures unfolded.

First, in sketchy, half-formed pictures, I saw her return to the village, of her people; her welcome there, with curious crowds around her, questioning her. Their incredulous expressions as she told them of her experience were ludicrous. Her meeting with her father and mother brought a little catch to my throat, and I looked across the pool at Mercer. I knew that he, too, was glad that we bad put her back into the sea when she wished to go.

These pictures faded hastily, and for a moment there was only the circular swirling as of gray mist; that was the symbol she adopted to denote the pa.s.sing of time. Then, slowly, the picture cleared.

It was the same village I had seen before, with its ragged, warped, narrow streets, and its row of dome-shaped houses, for all the world like Eskimo igloos, but made of coral and various forms of vegetation.

At the outskirts of the village I could see the gently moving, shadowy forms of weird submarine growths, and the quick darting shapes of innumerable fishes.

Some few people were moving along the streets, walking with oddly springy steps. Others, a larger number, darted here and there above the roofs, some hovering in the water as gulls hover in the air, lazily, but the majority apparently on business or work to be executed with dispatch.

Suddenly, into the midst of this peaceful scene, three figures came darting. They were not like the people of the village, for they were smaller, and instead of being gracefully slim they were short and powerful in build. They were not white like the people of the girl's village, but swarthy, and they were dressed in a sort of tight-fitting shirt of gleaming leather--shark-skin, I learned later. They carried, tucked through a sort of belt made of twisted vegetation, two long, slim knives of pointed stone or bone.

But it was not until they seemed to come close to me that I saw the great point of difference. Their faces were scarcely human. The nose had become rudimentary, leaving a large, blank expanse in the middle of their faces that gave them a peculiarly hideous expression. Their eyes were almost perfectly round, and very fierce, and their mouths huge and fishlike. Beneath their sharp, jutting jaws, between the angle of the jaws and a spot beneath the ears, were huge, longitudinal slits, that intermittently showed blood-red, like fresh gashes cut in the sides of their throats. I could see even the hard, bony cover that protected these slits, and I realized that these were gills! Here were representatives of a people that had gone back to the sea ages before the people of the girl's village.

Their coming caused a sort of panic in the village, and the three noseless creatures strode down the princ.i.p.al street grinning hugely, glancing from right to left, and showing their sharp pointed teeth.

They looked more like sharks than like human beings.

A committee of five gray old men met the visitors, and conducted them into one of the larger houses. Insolently, the leader of the three shark-faced creatures made demands, and the scene changed swiftly to make clear the nature of those demands.

The village was to give a number of its finest young men and women to the shark-faced people; about fifty of each s.e.x, I gathered, to be servants, slaves, to the noseless ones.

The scene shifted quickly to the interior of the house. The old men were shaking their heads, protesting, explaining. There was fear on their faces, but there was determination, too.

One of the three envoys snarled and came closer to the five old men, lifting a knife threateningly. I thought for an instant that he was about to strike down one of the villagers; then the picture dissolved into another, and I saw that he was but threatening them with what he could cause to happen.

The fate of the village and the villagers, were the demands of the three refused, was a terrible one. Hordes of the noseless creatures came swarming. They tore the houses apart, and with their long, slim white weapons they killed the old men and women, and the children. The villagers fought desperately, but they were outnumbered. The shark-skin kirtles of the invaders turned their knives like armor, and the sea grew red with swirling blood that spread like scarlet smoke through the water. Then, this too faded, and I saw the old men cowering, pleading with the three terrible envoys.

The leader of the three shark-faced creatures spoke again. He would give them time--a short revolving swirl of gray that indicated only a brief time, apparently--and return for an answer. Grinning evilly, the three turned away, left the dome-shaped house, and darted away over the roofs of the village into the dim darkness of the distant waters.

I saw the girl, then, talking to the elders. They smiled sadly, and shook their heads hopelessly. She argued with them earnestly, painting a picture for them: Mercer and myself, as she viewed us, tall and very strong and with great wisdom in our faces. We too walked along the streets of the village. The hordes of shark-faced ones came, like a swarm of monstrous sharks, and--the picture was very vague and nebulous, now--we put them to rout.

She wished us to help her, she had convinced the elders that we could.

She, her mother and father, started out from the village. Three times they had fought with sharks, and each time they had killed them. They had found the sh.o.r.e, the very spot where we had put her back into the sea. Then there was a momentary flash of the picture she had called up, of Mercer and I putting the shark-faced hordes to rout, and then, startlingly, I was conscious of that high, pleading sound--the sound that I had heard once before, when she had begged us to return her to her people.

The sound that I knew was her word for "_Please!_"

There was a little click. Mercer had turned the switch. He would transmit now; she and I would listen.

In the center of the village--how vaguely and clumsily he pictured it!--rested the _Santa Maria_. From a trap in the bottom two bulging, gleaming figures emerged. Rushing up, a glimpse through the face-plates revealed Mercer and myself. The shark-faced hordes descended, and Mercer waved something, something like a huge bottle, towards them. None of the villagers were in sight.

The noseless ones swooped down on us fearlessly, knives drawn, pointed teeth revealed in fiendish grins. But they did not reach us. By dozens, by scores, they went limp and floated slowly to the floor of the ocean. Their bodies covered the streets, they sprawled across the roofs of the houses. And in a few seconds there was not one alive of all the hundreds who had come!

I looked down at the girl. She was smiling up at me through the clear water, and once again I felt the strange, strong tug at my heart-strings. Her great dark eyes glowed with a perfect confidence, a supreme faith.

We had made her a promise.

I wondered if it would be possible to keep it.

In the day following, the _Santa Maria_ was launched. Two days later, trial trips and final adjustments completed, we submerged for the great adventure.

It sounds very simple when recorded thus in a few brief lines. It was not, however, such a simple matter. Those three days were full of hectic activity. Mercer and I did not sleep more than four hours any of those three nights.

We were too busy to talk. Mercer worked frantically in his laboratory, slaving feverishly beside the big hood. I overlooked the tests of the submarine and the loading of the necessary supplies.

The girl we had taken back to her parents, giving her to understand that she was to wait. They went away, but every few hours returned, as though to urge us to greater haste. And at last we were ready, and the girl and her two companions seated themselves on the tiny deck of the _Santa Maria_, just forward of the conning tower, holding themselves in place by the chains. We had already instructed the girl in her duties: we would move slowly, and she should guide us, by pointing either to the right or the left.

I will confess I gave a last long, lingering look at the sh.o.r.e before the hatch of the conning tower was clamped down. I was not exactly afraid, but I wondered if I would ever step foot on solid land again.

Standing in the conning tower beside Mercer, I watched the sea rise at an angle to meet us, and I dodged instinctively as the first green wave pelted against the thick porthole through which I was looking. An instant later the water closed over the top of the conning tower, and at a gentle angle we nosed towards the bottom of the sea.

An account of the trip itself, perhaps, does not belong in this record. It was not a pleasant adventure in itself, for the _Santa Maria_, like every undersea craft, I suppose, was close, smelly, and cramped. We proceeded very slowly, for only by so doing could our guide keep her bearings, and how she found the way was a mystery to all of us. We could see but very little, despite the clearness of the water.

It was by no means a sight-seeing trip. For various reasons, Mercer had cut our crew to the minimum. We had two navigating officers, experienced submarine men both, and five sailors, also experienced in undersea work. With such a short crew, Mercer and I were both kept busy.

Bonnett, the captain, was a tall, dark chap, stooped from years in the low, cramped quarters of submarines. Duke, our second-officer, was a youngster hardly out of his 'teens, and as clever as they come. And although both of them, and the crew as well, must have been agog with questions, neither by word nor look did they express their feelings.

Mercer had paid for obedience without curiosity, and he got it.

We spent the first night on the bottom, for the simple reason that had we come to the surface, we might have come down into territory unfamiliar to our guide. As soon as the first faint light began to filter down, however, we proceeded, and Mercer and I crowded together into the conning tower.

"We're close," said Mercer. "See how excited they are, all three of them."

The three strange creatures were holding onto the chains and staring over the bulging side of the ship. Every few seconds the girl turned and looked back at us, smiling, her eyes shining with excitement.

Suddenly she pointed straight down, and held out her arm in unmistakable gesture. We were to stop.