Kirk and Spock happen upon a chamber containing thousands of the silicon nodules. The creature causes a cave-in that separates Kirk from Spock. Though Spock urges Kirk to kill it, Kirk observes the creature backs off whenever he aims his phaser at it. Spock finds a way around the cave-in and joins Kirk. He attempts a mind meld with the creature, but perceives little but intense pain. The creature etches the ambiguous message "NO KILL I" into a rock, having gained some knowledge of human language from the meld. By making physical contact with the creature, Spock establishes a deeper mind meld. He learns that the creature is called a Horta, and that its species dies out completely every 50,000 years, save for one individual that remains alive to protect the eggs, which are the silicon nodules. As the nodule eggs hatch, the single adult Horta acts as a protectant mother to this next generation. Though nearing death because of her wound, the Horta communicates through Spock, telling them the location of the stolen pump. There Kirk also discovers thousands of broken eggs which were destroyed by the miners as worthless.