"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.