Drake ducked as dirt rained down. He closed his eyes tight.

Then the shaking stopped. Drake opened his eyes.

All the candles had gone out. He looked behind him in the darkness. "Worm, are you all right?"

Worm looked fine. In fact, he didn't have any dust on him. Everybody else was pretty dirty.

"Is everybody okay?" Drake asked.

Ana was on the ground. Bo helped her up.

"I'm fine, " she said. "That was scary, though!"

Rori walked over. "I'm sorry," she said. "I don't know why that weird ball of light made Vulcan freak out."

Drake looked around. "Thankfully, it's gone now."

"We should get back," Bo said nervously.”

Drake looked past Worm. The tunnel was blocked with rocks and dirt.

"I don't think we can," Drake said

"The way outside is blocked, too," Rori said.

"We're trapped!" said Bo. He turned pale.

Ana's dragon made a sad sound.

"It's okay, Kepri," Ana said, stroking Kepri's snout. "Can you give us some light, please?"

Kepri opened her mouth and a beautiful, white ball of light came out. The light hung in the air.”

“Vulcan is strong," Rori said. "He should be able to push through the rocks."

Vulcan was calmer now that the red orb was gone. He pushed at the rock wall, but the rocks didn't budge.

"Come on, Vulcan!" Rori urged him. But Vulcan couldn't break through.

Bo spoke up. "I could have Shu blast through the rocks with water."

Ana frowned. "What if it doesn't work? Then the tunnel will fill with water."

Everybody was quiet. They knew Ana was right. They were stuck.

Drake looked at Worm. "Sorry I got you into this," he whispered.

Then Worm's green eyes started to glow. A green light swept from the top of Worm's head to the end of his tail.

Drake jumped back. "Worm?" He felt something warm on his chest. He looked down to see that his Dragon Stone was glowing, too!

Ana, Rori, and Bo's mouths dropped open. They stared at Worm and Drake. Worm's green glow filled the tunnel.

"Drake, it looks like your dragon's going to explode!" Rori yelled.