There was one more task to perform, and Wells lost no time in doing it. When two hundred yards away he halted the NX-1, steadied her and sighted the stern tubes just above the dark tunnel hole. Quickly he sent forth two torpedoes.
A huge roar rumbled through the water, whipping the beds of kelp to mad convulsions. "Turn around," the commander ordered harshly. He sighted his bow tubes and again let loose a bolt of two torpedoes. Then he sent the submarine forward, and, through the teleview, examined what his four weapons had done.
Huge chunks of rock had been tumbled down, completely closing the tunnel.
"Well," said Graham, "it's over! Finished! They'll never get through that!"
full-throated cheer burst from the men below, a cheer that rang for minutes as they realized they were free forever of the octopi, of the cold underwater city, of the clutching tentacles. Graham grinned broadly.
"Sound happy—eh?" he chuckled. "Say, Keith, it's good we've got those two octopi our fighting cook killed. Knapp would never believe our story without them!"
He stared curiously at his commander. Wells was standing quite still, facing the teleview screen. A strange, far-away look was in his eyes.
"What's the matter, old man?" the first officer asked, smiling straight at him. "Aren't you glad we won through?"