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 shore 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. * * * * *