"Whoa!" Emily Kinney's voice echoed around the damp cave. She peered in and motioned to her friends. "Come on, guys!" Isabella Garcia-Shapiro edged along the steep cliff. "This cliff gives me the heebie-jeebies." Accepting Phineas's hand, the four kids crawled inside the cave. Ferb's eyes widened. Inside the cave, it was deep, dank, and sparkling from the little light in the cave. "What if it's diamonds?" Emily whispered excitedly. Ferb silently produced a pick-axe and went to go mining. After a few minutes, he came back.