Fitted with a long, sharp steel ram¹ in front, the Advance was peculiarly adapted for this sort of work. In designing the ship this ram was calculated to be used against hostile vessels² in war time, for the submarine was at first, as we know, destined³ for a Government boat. Now the ram was to serve a good turn.  
To make sure that the attempt would be a success, the machinery⁴ of the craft was carefully gone over. It was found to be in perfect order, save for a few adjustments which were needed. Then, as it was night, though there was no difference in the appearance of things below the surface, it was decided⁵ to turn in, and begin work in the morning. Nor did the gold-seekers go to the surface, for they feared they might encounter a storm.
 
"We had trouble enough locating the wreck⁶," said Captain Weston, "and if we go up we may be blown off our course. We have air enough to stay below, haven't we, Tom?"
 
"Plenty," answered the lad, looking at the gages.
 
After a hearty⁷ breakfast the next morning, the submarine crew got ready for their hard task. The craft was backed away as far as was practical, and then, running at full speed, she rammed⁸ the wreck. The shock was terrific, and at first it was feared some damage had been done to the Advance, but she stood the strain.
 
"Did we open up much of a hole?" anxiously asked Mr. Swift.
 
"Pretty good," replied Tom, observing it through the conning⁹ tower bull's-eyes, when the submarine had backed off again. "Let's give her another."
 
Once more the great steel ram hit into the side of the Boldero, and again the submarine shivered from the shock. But there was a bigger hole in the wreck now, and after Captain Weston had viewed it he decided it was large enough to allow a person to enter and place a charge of dynamite¹⁰ so that the treasure ship would be broken up.
 
Tom and the captain placed the explosive. Then the Advance was withdrawn¹¹ to a safe distance. There was a dull rumble¹², a great swirling¹³ of the water, which was made murky¹⁴; but when it cleared, and the submarine went back, it was seen that the wreck was effectively broken up. It was in two parts, each one easy of access.
 
"That's the stuff!" cried Tom. "Now to get at the gold!"
 
"Yes, get out the diving suits," added Mr. Damon. "Bless my watch-charm, I think I'll chance it in one myself! Do you think the sharks are all gone, Captain Weston?"
 
"I think so."
 
In a short time Tom, the captain, Mr. Sharp and Mr. Damon were attired¹⁵ in the diving suits, Mr. Swift not caring to venture into such a great depth of water. Besides, it was necessary for at least one person to remain in the submarine to operate t............