For a few minutes after reaching the wreck¹, which had so occupied their thoughts for the past weeks, the adventurers did nothing but gaze at it from the ports of the submarine. The appearance of the deep-water sharks gave them no concern, for they did not imagine the ugly creatures would attack them. The treasure-seekers were more engrossed² with the problem of getting out the gold.  
"How are we going to get at it?" asked Tom, as he looked at the high sides of the sunken ship, which towered well above the comparatively small Advance.
 
"Why, just go in and get it," suggested Mr. Damon. "Where is gold in a cargo³ usually kept, Captain Weston? You ought to know, I should think. Bless my pocketbook!"
 
"Well, I should say that in this case the bullion⁴ would be kept in a safe in the captain's cabin," replied the sailor. "Or, if not there, in some after part of the vessel⁵, away from where the crew is quartered. But it is going to be quite a problem to get at it. We can't climb the sides of the wreck, and it will be impossible to lower her ladder over the side. However, I think we had better get into the diving suits and take a closer look. We can walk around her."
 
"That's my idea," put in Mr. Sharp. "But who will go, and who will stay with the ship?"
 
"I think Tom and Captain Weston had better go," suggested Mr. Swift. "Then, in case anything happens, Mr. Sharp, you and I will be on board to manage matters."
 
"You don't think anything will happen, do you, dad?" asked his son with a laugh, but it was not an easy one, for the lad was thinking of the shadowy forms of the ugly sharks.
 
"Oh, no, but it's best to be prepared," answered his father.
 
The captain and the young inventor lost no time in donning the diving suits. They each took a heavy metal bar, pointed⁶ at one end, to use in assisting them to walk on the bed of the ocean, and as a protection in case the sharks might attack them. Entering the diving chamber⁷, they were shut in, and then water was admitted until the pressure was seen, by gauges⁸, to be the same as that outside the submarine. Then the sliding steel door was opened. At first Tom and the captain could barely move, so great was the pressure of water on their bodies. They would have been crushed but for the protection afforded by the strong diving suits.
 
In a few minutes they became used to it, and stepped out on the floor of the ocean. They could not, of course, speak to each other, but Tom looked through the glass eyes of his helmet at the captain, and the latter motioned for the lad to follow. The two divers⁹ could breathe perfectly¹⁰, and by means of small, but powerful lights on the helmets, the way was lighted for them as they advanced.
 
Slowly they approached the wreck, and began a circuit of her. They could see several places where the pressure of the water, and the strain of the storm in which she had foundered¹¹, had opened the plates of the ship, but in no case were the openings large enough to admit a person. Captain Weston put his steel bar in one crack, and tried to pry¹² it farther open, but his strength was not equal to the task. He made some peculiar¹³ motions, but Tom could not understand them.
 
They looked for some means by which they could mount to the decks of the Boldero, but none was visible. It was like trying to scale a fifty-foot smooth steel wall. There was no place for a foothold. Again the sailor made some peculiar motions, and the lad puzzled over them. They had gone nearly around the wreck now, and as yet had seen no way in which to get at the gold. As they passed around the bow, which was in a deep shadow from a great rock, they caught sight of the submarine lying a short distance away. Light streamed from many bull's-eyes, and Tom felt a sense of security as he looked at her, for it was lonesome enough in that great depth of water, unable to speak to his companion, who was a few feet in advance.
 
Suddenly there was a swirling¹⁴ of the water, and Tom was nearly thrown off his feet by the rush of some great body. A long, black shadow passed over his head, and an instant later he saw the form of a great shark launched at Captain Weston. The lad involuntarily cried in alarm, but the result was surprising. He was nearly deafened¹⁵ by his own voice, confined as the sound was in the helmet he wore. But the sailor, too, had felt the movement of the water, and turned just in time. He thrust upward with his pointed bar. But he missed the stroke, and Tom, a moment later, saw the great fish turn over so that its mouth, which is far underneath¹⁶ its snout, could take in the queer shape which the shark evidently thought was a choice morsel¹⁷. The big fish did actually get the helmet of Captain Weston inside its jaws¹⁸, but probably it would have found it impossible ............