He was probing the darkness with a spotlight, looking for rocks, when the tall fin came into view.

Two big steerable propellers stood high on smooth, tall fins at the rear.

The aircraft had a conventional tail with a tall, straight vertical fin.

Gradually the tall fin sank below the surface, and they saw the long dark shape of his body recede into the depths.

One of them led a huge, wallowing lizard with tall fins on its back.

That would be those tall fins over there.

At the rear there was a tall fin with an unbalanced rudder.

He turned to his right and saw a tall curved fin cutting through the water in his direction.

"Looks something like a shark," said Curt, glancing over the side at a tall black fin that was dogging the vessel.

The 108-3 introduced a taller vertical fin with a rudder featuring a straight trailing edge.