“How beautifully clear the water is！” said Lucy to herself， as she leaned over the port side early in the afternoon of the second day.
And it was. The first thing that she noticed was a little black object， about the size of a shoe， travelling along at the same speed as the ship. For a moment she thought it was something floating on the surface. But then there came floating past a bit of stale bread which the cook had just thrown out of the galley. And the bit of bread looked as if it were going to collide with the black thing， but it didn‘t. It passed above it， and Lucy now saw that the black thing could not be on the surface. Then the black thing suddenly got very much bigger and flicked back to normal size a moment later.