In attempting to make them turn back, Mansing threw a stone at them, which, instead of having the desired effect, sent them on all the faster. The current was strong, and the bottom of the river so soft that they both sank. When they reappeared on the surface it was only to float rapidly away down-stream. We watched them with ever-increasing anxiety. They seemed quite helpless. We ran panting along the river-bank, urging them on with shouts in order to drive them to the other side. In their desperate struggle to keep afloat, and powerless against the current, the two yaks collided violently in mid-stream. The bump caused the pack-saddle and load of the smaller yak to turn over. The animal, thus overbalanced and hampered, sank and reappeared two or three times, struggling for air and life. It was, indeed, a terrible moment. In order to save the load, I threw off my clothes and jumped into the water. I swam fast to the animal, and, with no small exertion, pulled him on shore, some two hundred yards farther down-stream. We were both safe, though breathless; but, alas! the ropes that held the baggage had given way, and saddle and load had disappeared. This loss was a dreadful blow to me. I tried hard, by repeatedly diving into the river until I was almost frozen, to recover my goods, but failed to find them or even to locate them. Where I suspected them to be the water was over twenty feet deep. The bottom of the river was of soft mud, so that the weight alone of the loads would cause them to sink and be covered over. Diving at such great elevations gave a peculiar and unpleasant sensation. The moment I was entirely under water, I felt as if I were compressed under an appalling weight which seemed to crush me. Had the liquid above and around me been a mass of lead instead of water, it could not have felt heavier. The sensation was especially noticeable in my head, which felt as if my skull were being screwed inside a vise. The beating in my temples was almost unbearable. Under ordinary circumstances I can remain under water for over a minute, but at such high elevations I could never hold out for longer than fifteen or twenty seconds. Each time that I emerged from below, gasping for air, my heart beat alarmingly violently, and my lungs seemed as if about to burst.