to see the motion. He nodded and smiled.

Regan cut the power of the rocket engine and let the current speed his journey. The man outside increased his own pace, and when another bridge swept overhead, he nodded and held up one finger. Regan trembled with relief at this confirmation of the pantomimed message. He fought back the weariness that had begun to creep over him again, and clung doggedly to the rocket whose exhaust regulated his speed to that of the running man.

Regan thought the bridge would never be reached. He felt supremely weary. He was sopping wet, his eyes kept going out of focus, his throat ached, and his head was throbbing with jagged pains. It took all his waning strength to cling to consciousness.

Finally the bridge was in sight; then overhead. The running man pointed up. Beyond the bridge, the glasslike covering ended.

Regan was out of the tunnel.

The river widened now and its velocity eased. But the current was still a powerful one. Regan pointed the rocket tube so that it thrust him upward. His rubber- and steel-clothed head broke the surface. He felt a surge of freedom.

In his joy, Regan lost control of the rocket-brake and was twisted crazily about. Instinctively he shut off the power; he was swept ahead. As the river whirled him forward, he saw the man on the bank point ahead to the right, wave him on and gesture that he would catch up later.

It was with relief that Regan let himself be carried forward by the strong current. He was traveling out of the mainstream now. In a few minutes, the river was so broad that he seemed to be barely moving, but this was merely an illusion of contrast.

Then Regan saw the mesh fence. It was a giant strainer across the river, apparently fashioned to prevent debris from being carried into the structure which straddled the river beyond—without doubt the hydroelectric plant whose existence he had dreaded.

Regan was swept into the fence. It gave, cushioning the shock, and he pulled himself along it toward the bank. He reached it but lacked the strength to pull himself onto land.

Nearby, hugging the huge mesh fence, was the cask which had passed him back in the dark of the tunnel.

Just as Regan was passing out, he saw the stocky man in the knee-length shorts come into sight, 

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