The young diver turned on the electric lights and gazed around him, curiously.

He gave a start of surprise, and not without reason.

The waters were no longer dark and black.

There was a peculiar glow of light coming up from somewhere below, and in the water floated something closely resembling smoke or clouds.

"What did this mean!"

"It's like another world," he thought. "And what strange fish!"

But then he caught sight of something which filled him with alarm.

A number of small fish had come up around the diving bell and were now swarming all over it, inside and out.

Each fish was less than six inches long, but there were hundreds of them darting hither and thither, churning up the water as before, and emitting a strange, hissing sound.

He tried to get back to the diving bell, but found the effort a failure.