Accordingly The Hawk continued at rather slow speed.
Half an hour later, Frank, forward, made out a dark hulk lying low in the water a short distance ahead. He immediately called Lord Hastings' attention to the object.
The latter acted quickly.
"Extinguish all lights quickly," he called sharply.
The order was obeyed, and at a second command, The Hawk was slowed down so that she was barely moving.
"What's the matter, sir?" exclaimed Jack, in great surprise.
"Matter is that there is a submarine dead ahead of us," was his commander's reply.
"You mean that dark object there?"
"Yes."
"And are we going to sink her, sir?" asked Jack.