Like a bird descending from some dizzy height, the Vulture landed close to the pool of black water. It was a small lake and the darkness must have been caused by its depth, for later when they took some out in a glass it was as clear as a crystal. Then, too, there might have been black rocks on the bottom. "Can it be possible that we are here at last?" cried Tom, above the noise of the gale, for the wind was blowing at a terrific rate. But our friends knew better now how to adjust themselves to it, and the lake was down in a valley, the sides of which cut off the power of the gale. As for the glider it was only necessary to equalize the balance and it would remain stationary in any wind. "This is the place! This is the place!" cried Ivan Petrofsky. "Don't you remember, Peter?" "Indeed I do! I have good cause to! This is where we found the platinum!" "Bless my soul!" cried Mr. Damon. "Where is it, in the lake?" "The mine itself is just beyond that barrier of broken and twisted trees," replied the elder Russian brother. "It is an irregular opening in the ground, as though once, centuries ago, an ancient people tried to get out the precious metal. We will go to it at once." "But it is getting late," objected Ned. "No matter," said Tom. "If we find any platinum we'll stay here all night, and longer if necessary to get a good supply. This is better than the city of gold, for we're in the open." "I should say we were," observed Mr. Damon, as he bent to the blast, which was strong, sheltered even as they were. "Will it be safe to remain all night?" asked Mr. Borious, with a glance about the desolate country. "We have plenty of food," replied Tom, "and a good place to stay, in the car of the glider. I don't believe we'll be attacked." "No, not here," said the elder Petrofsky. "But we still have to go back across Siberia to escape." "We'll do it!" cried Tom. "Now for the platinum treasure!" They went forward, and it was no easy work. For the wind still blew with tremendous force though nothing like what it did higher up. And the ground was uneven. They had to cling to each other and it was very evident that no airship, not even the powerful Falcon, could have reached the place. Only an air glider would answer. It took them half an hour to get to the opening of the ancient mine, and by that time it was nearly dark. But Tom had thought to bring electric torches, such as he had used in the underground city of gold, and they dispelled the gloom of the small cavern. "Will you go in?" asked Ivan Petrofsky, when they had come to the place. He looked at Tom. "Go in? Of course I'll go in!" cried our hero, stepping forward. The others followed. For some time they went on, and saw no traces of the precious metal. Then Ned uttered a cry, as he saw some dull, grayish particles imbedded in the earth walls of the shaft. "Look!" he cried. Tom was at his chum's side in a moment.