"Only the wind," replied the captain. "The storm has arrived."
The howling kept up, and soon the ship began to rock. The wind increased, and a little later there could be heard, through an opened port in the prisoners' cabin, the dash of rain.
"It's a regular hurricane!" exclaimed the captain. "I wonder if the cables will hold?"
"What about the submarine?" asked Mr. Swift anxiously.
"I haven't much fear for her. She lies so low in the water that the wind can't get much hold on her. I don't believe she'll drag her anchor."
Once more came a fierce burst of wind, and a dash of rain, and then, suddenly above the outburst of the elements, there sounded a crash on deck. It was followed by excited cries.
"Something's happened!" yelled Tom. The prisoners gathered in a frightened group in the middle of the cabin. The cries were repeated, and then came a rush of feet just outside the cabin door.
"Our guards! They're leaving!" shouted Tom.
"Right!" exclaimed Captain Weston. "Now's our chance! Come on! If we're going to escape we must do it while the storm is at its height, and all is in confusion. Come on!"
Tom tried the door. It was locked.