Lady Aurex led them to a window which faced the side of the great dome which covered all the village, and they could see that the island was indeed sinking, for the water of the lake was already half way up the side of the dome. Through the glass could be seen swimming fishes, and tall stalks of swaying seaweeds, for the water was clear as crystal and through it they could distinguish even the farther shore of the lake.
"The Flatheads are not here yet," said Lady Aurex. "They will come soon, but not until all of this dome is under the surface of the water."
"Won't the dome leak?" Dorothy inquired anxiously.
"No, indeed."
"Was the island ever sub-sub-sunk before?"
"Oh, yes; on several occasions. But Coo-ee-oh doesn't care to do that often, for it requires a lot of hard work to operate the machinery. The dome was built so that the island could disappear. I think," she continued, "that our Queen fears the Flatheads will attack the island and try to break the glass of the dome."
"Well, if we're under water, they can't fight us, and we can't fight them," asserted Dorothy.
"They could kill the fishes, however," said Ozma gravely
"We have ways to fight, also, even though our island is under water," claimed Lady Aurex. "I cannot tell you all our secrets, but this island is full of surprises. Also our Queen's magic is astonishing."
"Did she steal it all from the three Adepts in Sorcery that are now fishes?"
"She stole the knowledge and the magic tools, but she has used them as the three Adepts never would have done."
By this time the top of the dome was quite under water and suddenly the island stopped sinking and became stationary.
"See!" cried Lady Aurex, pointing to the shore. "The Flatheads have come."
On the bank, which was now far above their heads, a crowd of dark figures could be seen.
"Now let us see what Coo-ee-oh will do to oppose them," continued Lady Aurex, in a voice that betrayed her excitement.
* * * * * * * *
The Flatheads, pushing their way through the line of palm trees, had reached the shore of the lake just as the top of the island's dome disappeared beneath the surface. The water now flowed from shore to shore, but through the clear water the dome was still visible and the houses of the Skeezers could be dimly seen through the panes of glass.
"Good!" exclaimed the Su-dic, who had armed all his followers and had brought with him two copper vessels, which he carefully set down upon the ground beside him. "If Coo-ee-oh wants to hide instead of fighting our job will be easy, for in one of these copper vessels I have enough poison to kill every fish in the lake."
"Kill them, then, while we have time, and then we can go home again," advised one of the chief officers.
"Not yet," objected the Su-dic. "The Queen of the Skeezers has defied me, and I want to get her into my power, as well as to destroy her magic. She transformed my poor wife into a Golden Pig, and I must have revenge for that, whatever else we do."
"Look out!" suddenly exclaimed the officers, pointing into the lake; "something's going to happen."
From the submerged dome a door opened and something black shot swiftly out into the water. The door instantly closed behind it and the dark object cleaved its way through the water, without rising to the surface, directly toward the place where the Flatheads were standing.
"What is that?" Dorothy asked the Lady Aurex.
"That is one of the Queen's submarines," was the reply. "It is all enclosed, and can move under water. Coo-ee-oh has several of these boats which are kept in little rooms in the basement under our village. When the island is submerged, the Queen uses these boats to reach the shore, and I believe she now intends to fight the Flatheads with them."
The Su-dic and his people knew nothing of Coo-ee-oh's submarines, so they watched with surprise as the under- water boat approached them. When it was quite near the shore it rose to the surface and the top parted and fell back, disclosing a boat full of armed Skeezers.