The green man was almost of heroic proportions; he was clad in but a breech-clout, and was so broad as to appear squat in stature. He carried a short club, and appeared almost as dumbfounded as the two Americans. A moment he regarded them, then, with a ferocious snarl of rage, he hurled himself upon the startled Ward and half clubbed, half pushed him to the floor. Recovering from his momentary inaction and realizing the danger in which his friend stood, Miles shouted and leaped upon the green man's back, fastening his sinewy fingers about the giant's throat. But the latter was possessed of incredible strength, and, straightening up, he shook off Miles as a bear might shake off an attacking dog, and threw him heavily to the floor. Then the green giant whirled up his club, and it would have gone hardly with Miles if Ward had not remembered his automatic and fired in the nick of time. As if poleaxed, the green man fell; and both the adventurers recovered their feet. "Look out!" shouted Ward. Through a wide entrance came charging a dozen greenish giants. Miles fired both his pistols. The leader of the greenish men paused in mid-leap, clawing at his stomach. "This way, Kid!" yelled Ward; "this way!" Taking advantage of the confusion in the ranks of the attackers, the two sprang to where an exit in the far wall promised an avenue of escape. Down a broad passage they rushed. Seemingly the passage ended in a cul-de-sac, for a wall of blank whiteness barred further progress. Behind them came charging the greenish giants uttering appalling cries. Desperately the two Americans turned, resolved to sell their lives as dearly as possible; but at that moment happened a sheer miracle. The blank wall divided, revealing a narrow crevice through which they sprang. Noiselessly the crevice closed behind them, shutting out the green pursuers, and a voice said--a voice in precise but strangely accented English: "We have been expecting you, gentlemen, but--where is Solino?" * * * * * Never would Miles and Ward forget the amazement of that moment. They were in a place which looked not unlike a huge laboratory. Then they saw it was a lofty room containing a variety of strange mechanisms. But it was not on these their eyes focussed. Confronting them in odd wheelchairs, with hairless heads projecting from tubular containers like the one they had seen encasing the man at the control board of the submarines, were all of half a hundred crippled men! "Good Lord!" exclaimed Miles, "I must be seeing things!" "Where is Solino?" demanded the voice in strangely accented English. Ward saw that the question came from an individual in a wheelchair a few feet in front of them. "Solino is dead," he answered. "Dead?" A ripple of sound came from the oddly seated men. "Yes, the submarine car was wrecked in the tunnel, and everyone aboard was killed save us two."