It represented one of the carefully thought-out details in a stupendous, far-reaching plot.
If there were signals between the motor boat and the two men aboard the steamship, they were not observed by the lookouts.

In all probability no signals were given.

The little craft was to be at a certain place at a certain hour,--and she was there! The men who jumped knew that she would be there.

A black, tiny speck on the broad expanse of water, sheltered by a night of almost stygian darkness, she lay outside the narrow radius to which visual observation was confined, patiently waiting for the Doraine to pass a designated point.

There was to be no miscalculation on the part of either the boat or the men who went over the side of the big steamship into the seething waters.
The closest inquiry among the members of the crew failed to reveal any one who had witnessed the leap of the men.