"We did not see any hole when we went down the pa.s.sage," Bertie said.

"No. Most likely a hole something like this was cut in the rock outside, and a pipe driven to the bottom of this cistern. They would only have to fill the one in the tunnel with cut blocks to within a foot of the surface, and with smaller stones to the same level as the bed of the stream; then the water in the cistern would always be level with that outside. They put it in this end so as to be well out of reach of the salt water farther in. They were no fools who built this place. However closely they were besieged, and even if the enemy occupied the s.p.a.ce in front of the house, their water-supply was secure."

"But in time of floods, Harry, if the water rose a foot in the pa.s.sage--and we saw it did more than that--it would flood the whole of this bas.e.m.e.nt."

"That is so, Bertie; but you may be sure that there was some provision against that. They would have some valve that they could shut, or possibly there was a block of wood covered with leather that they could push into the pipe at the bottom of this cistern."

Beyond a considerable store of firewood, in large and small blocks, nothing could be seen in the chamber.

"I expect these two places were used as prisons," Harry said, "though in case a very large force were a.s.sembled some may have slept here. At ordinary times the upper rooms would be quite sufficient. But you see they had to build the whole height of the rocky arch, and they wanted the entrance to the place to be so far above the ground-level that it would be extremely difficult for an enemy to climb into it. A hostile force could only have come in at that entrance, and a small body of determined men might have held it against a host. These lower chambers were simply cellars; the store-rooms were above them, and the habitable part of the castle. Now let us look at the chamber on the other side; no doubt we shall find it just like this."

This proved to be the case. There were another cistern and more piles of firewood, otherwise it was empty. After a short survey they returned to the main chamber, bringing up with them two of the empty leather bags. In these they placed the bones of the dead, the remains all crumbling when touched, as the first skeleton had done. The bags were lowered to the ground, and the four searchers descended and carried them to the mouth of the ravine. In a spare bag which they brought with them they placed the bones of the two skeletons on the steps, and then carried them all out to the open valley.

"We will bury them when we move the camp down here to-morrow morning,"

Harry said. "We forgot the two up at that window. That is no matter, we can throw them out to-morrow; they will lie as well at the bottom of the sea as in the earth here."

Not much was said as they returned to the castle. They had been a very silent party all day. The gloom and darkness, the way in which their voices echoed in the empty hall, had exercised a depressing effect on them; and Donna Maria, generally the most talkative of the party, had not quite recovered from the shock which the exit of the bats had given her. It was not until she had cooked a meal, and they all sat down to it, that they quite recovered their spirits. They had found Jose awaiting their return. He had a blazing fire, having brought down as much firewood as he could carry, and Dias had briefly told him the result of their explorations.

"Well, Harry, what do you think altogether?" Bertie asked after the meal was over.

"I think we ought to be very well satisfied," he replied. "Everything has borne out the ideas we had. The castle may have been built as a fortress by some great chief, certainly before the time of the Incas, or it may have been used for a prison. The ornaments and things we found showed that it was known to the Incas. They would have had no occasion to use it when they were undisputed masters of the country, but when the troubles came with the Spaniards a garrison was placed here, and possibly some of their chiefs took refuge in the place. Then came the time when all opposition to the invaders ceased, and only a small body of men were left here to guard the secret, and the treasure if there were any. Generations may have pa.s.sed before the last of the garrison died of hunger, and probably all others who were in the secret fell in some insurrection or died in the mines. All this seems plain enough, except that possibly there was no treasure. That left by the Chimoos may have been discovered by the Incas. I should think it extremely likely that the ship Dias mentioned as setting out with a large amount of treasure was intended to land its stores here.

"It may have done so, or it may have sunk at sea. I am inclined to think that it was lost, because the traditions concerning these hidden treasures seem to be extremely accurate; and yet, as Dias says, none tell of any Inca treasure being concealed here. However, it is quite possible that the treasure did come here and was landed, and that the ship was then broken up, so that it might be supposed she was lost at sea, and that this was kept so profound a secret by the men here, that the news was never generally known even among the natives. So far our search to-day has been successful, but I see that a hunt for the treasure will be a very difficult one. Certainly in the upper chambers there doesn't appear any possibility of such a hiding-place existing.

The whole s.p.a.ce is accounted for. The walls are all of solid stone, and have no special thickness. If the roofs had been arched there might be empty s.p.a.ces on each side of the spring of the arch, but they are supported by pillars or walls, with only just s.p.a.ce between the floors for the beams of solid stone. Of course it is in the lowest room that one would expect to find hiding-places like those we saw at Pachacamac." He paused.

"Well, why should they not be there, Harry?"

"Because, as we saw, the floor is at most twelve inches above the water-level. How is it possible that they could have constructed chambers below that level, that is in the bed of a torrent? It is probable that the solid rock lies many feet below the bed of the stream. A portion of that great arch must from time to time have fallen into it; and it may be that the river once ran forty or fifty feet below its present level. In all the places that we have seen these treasure chambers were formed in solid adobe foundations, as the temples always stood on artificial terraces. With all our appliances at the present time it would be next to impossible to sink in a stratum of great rock fragments below the water level, and I do not believe that the old people here could have done so even had it been a solid rock.

The difficulties of excavating chambers in it would have been enormous.

They could split rocks with the grain, and all the stone walls we have seen were made of regular pieces, and evidently formed of stone so split. They were able to give them a sort of facing with great labour, but the tools they had were not made of material hard enough to work in solid rock, and the labour of excavating such chambers would have been stupendous. Therefore I am at a loss to imagine where any such chambers can be in that castle."

Dias nodded gravely. He had been with travellers who had done a great deal of excavation, and he was able to understand Harry's argument.

Maria, who was listening attentively, also understood it. Jose simply rolled cigarettes and smoked them. It was a matter for his elders, and he did not even try to follow what Harry was saying. There was some minutes' silence, and then Bertie said, "But the floors are all even."

"What do you mean, Bertie?" Harry asked in a puzzled tone.

"I mean, Harry, that they run straight along. There is no dip in them."

"Of course there isn't. Who ever heard of building floors on the slope?"

"Yes, that is what I mean. We know that the tunnel slopes down its own height. It is twelve feet high at the entrance, and at the lower end it is some inches below the level, so it falls twelve feet at least. At the end where the cistern is, the floor of the bas.e.m.e.nt is only a few inches above the bottom of the pa.s.sage; therefore at the other end it must be twelve feet above the water-level."

"You are right, Bertie!" Harry exclaimed. "What a fool I was not to think of it! There must be a s.p.a.ce underneath it a hundred feet long, sloping from nothing down to twelve feet. There is room for a dozen chambers such as those we saw on each side of the tunnel. Well done, Bertie! you have given me fresh hope. It would be a splendid hiding-place, for any searchers who came down and saw the water in the cistern would believe at once that, as neither the Chimoos nor the Incas could have known how to build under water, there was no use in searching for hidden chambers under this floor. You see, neither of them had any knowledge of cement or mortar. All their bricks and stones are laid without anything of the sort; and whatever amount of labour was available no chamber could be made under water, for as fast as holes were dug the water would come in, and even if they could line it with stone-work the water would penetrate through the cracks. Now, Dias, that we see with certainty where we have to dig, we can make our preparations. I will write down a list of the things we decided the other day we should want:--Six kegs of powder, two hundred feet of fuse, four boring-tools, six steel wedges, the smallest smith's fire you can buy--for we shall have to sharpen the tools,--six borers, a large bundle of torches, four sledge-hammers--we have enough pickaxes and shovels,--and another fifty fathoms, that is a hundred yards, of rope. I don't know anything else that we shall want in the mining way.

"You and your wife had better settle what provisions you must get. We shall certainly need a good supply of flour--a couple of sacks, I should think--tea, coffee, and sugar, dried or salted meat. And you might get a supply of smoked fish. I have no doubt that we shall catch fresh fish here in the sea, but we shall all be too busy to spend much time on that. You had better get three or four gallons of pulque; one cannot be always drinking coffee. We have still got a good stock of whisky and brandy. Your wife will certainly want a good supply of red pepper and other things for her stews. It would not be a bad thing to have a couple of crates of poultry. Don't pack them too closely, or half of them will be smothered before you get them here. Dead meat would be of no use, for it won't keep in this heat. We can turn them all out in the courtyard in front of the castle, and they can pick up their living there among the lower slopes of the cliffs. We can give them a few handfuls of grain a day. Don't get too many c.o.c.ks, and let the hens be young ones. They ought to supply us with plenty of eggs and some broods of chickens. You must calculate what the weight will be, and take the mules accordingly."

"Very well, senor. I need not be away more than three days at most. It is only about twenty miles to Ancon."

"You might take the two llamas down with you and sell them there. They have done good work, and I should not like to kill and eat them. So mind you sell them to someone who wants them for carriage work. We shall not require them any more for that purpose. Will you want to take Jose with you?"

"I think not, senor, for I should say that four baggage mules will be ample, and I can lead them myself; and certainly you will find Jose useful here."

Dias and his wife then withdrew a short distance from the fire, and engaged in an animated conversation as to the things she required.

"Don't stint matters," Harry said, raising his voice. "We may be here for the next two or three months, and the less frequently you have to go down to buy things the better. It would be easy to account for your first purchases by saying that you were going on an expedition to the mountains, but you could not go to the place with the same story again."

"There are other places I can go to, senor; but I will get a good store of everything this time."

Dias started at daybreak with four mules and the two llamas. The others rolled up the tent-beds and the remaining stores, loaded up the other mules, and moved down to the mouth of the ravine. Here they pitched the little tents again.

"They will form a central point for the mules to come to," Harry said.

"We will leave the sacks of maize here, but give the animals a good feed now. They will be sure to keep close to the spot. All the other things we will carry into the castle; but before we start we will bury these bags of bones."

When this was done, and the saddles taken off and piled together against the rocks, the other things were made up in portable packets, and they started up the ravine. They made three journeys before everything was brought to the foot of the ladder leading up to the window. Then the two brothers mounted, and hauled the things up with a rope which Jose, who remained below, fastened to them. When the last was up he went to the foot of the rock and brought several armfuls of the wood he had thrown down on the previous day. This was also hauled up.

"You had better fetch some more, Jose. We mean to keep a big fire burning here night and day; it will make the place cheerful. I will have a fire also burning where we are at work below. Now, senora, we will rig up some blankets on a line between the pillars at the end of the room opposite to that in which we found the skeletons, so as to make a special apartment for you and Dias. We will spread our beds at night near the fire."

The screen was soon made. A cord was run from the wall to the pillar next to it, some five feet above the floor, and three blankets were sufficient to fill the s.p.a.ce.

Harry was about to make another line from the pillar, when Maria said:

"I would rather not, senor; I am not a bit afraid. This screen is quite large enough, and it will be more cheerful not to be shut up altogether, as then, when I am lying down, I can see the reflection of the fire on the walls, and it will be much more cheerful."

Then a blazing fire was lit. The wood was almost as dry as tinder, and burnt without smoke. It was built almost touching the back wall, in which, some five feet above the fire, Harry with a pick made a hole four inches deep.

While he was doing this, Jose went down and cut a sapling four inches in diameter, growing in a cleft on the rock, and from this cut off two six-foot lengths and brought them up. One end of the thickest of these was driven into the hole and tightly wedged in there, the other end was lashed securely to an upright beam.

"There, Maria," he said when it was finished, "you will be able to hang your pots and kettles from that at any height you like above the fire.

Now, you can set to work as soon as you like, to get breakfast for us.

We have been at work for four or five hours, and have good appet.i.tes."

"I have the cakes ready to bake, senor, and I sha'n't be long before I get an olla ready for you."

"Well, Jose, what do you think of the place?" Harry asked.

"I should like it better if it were not so big," the lad said. "I shall want a broom, senor, to sweep out the dust."

"It is three inches deep," Maria said.

"I should not bother about that, Maria; it would be a tremendous job to sweep such a big room, and the dust is so fine that it would settle again and cover everything. Besides, it will be a good deal softer to lay our beds on than the stones would be, so I think you had better let it remain as it is, especially as you are fond of going about without your shoes. I think I will rig up a blanket against the doorway. It will make the place look a good deal more snug, and will keep the bats from returning."

"I am not afraid of the bats, now I know what they are; but I should be constantly expecting them to rush out again."

"I expect a good many went back last night," Harry said. "We won't put the blankets up till after dark. They are sure to come out again; then, as soon as they have gone, we will close it, and they won't be able to get in when they come back before daybreak."

Harry's expectations were fulfilled. At dusk a stream of bats rushed out again, but this time quite noiselessly. The rush lasted for three or four minutes. As soon as they had gone, the blankets were hung up, and fastened across the doorway.

"They will be puzzled when they come back."