The brothers reactivated mermaid powers and swam uner the sea once again. Koki zapped on, "Where were you guys?"

Martin grinned, "We found our long-lost sister! She's a pony, but she's helping us finish this puzzle with homemae pieces."

Jimmy asked, "What does a puzzle have to do with Aviva?"

Chris answered, "Aviva is the puzzle and there are lots of missing pieces to where she is. Now we know she's in a cave under a waterfall in the mysterous stairway between two cities, one under the sea and one on land."

Laura snorted, "There is no such city under the sea, unless it's ancient."

Martin shook his head, "Actually, she told us that it has people living in it!"

Chris wasn't paying attention to where he was swimming and soon met a rock, "OUCH!"

Martin laughed, "Where are we going? We have no idea where this city is?"

Chris rubbed his stomach, "I just realized that we have no shirts on. No wonder why it hurt twice as much. But Applay told us that it was UNDER the city on the land."

Martin thought, "Then, how can the city sit on a floating land surface? It would have strike land by now."

Koki gasped, "There is such a city underwater! It's in an air pocket, sitting in a den under the land's surface... Just feet from the castle."

Chris got the info on his pod and both brothers had a look on it... "Yeah," Said Chris, "The City is in the sea... The den was caved in, leaving water under the city's foot and an air pocket on top... This city's named Atlantis."

Martin pointed, "Look! A swirly drawing there!"

Koki answered, "That's the mysterious stairway. That's the mysterious stairway, and there's no waterfall."

Chris zapped the picture down, "That's why this place is so mysterious! No one's knows about it!"

Jimmy shook in fear, "What if it's a lie? What if Aviva is dead?"

Chris backed off a bit, "I know she's not... I know."

Martin shut the pod off, "We're busy now. Thanks for the info... Chris, what's that about?"

Chris scratched his head, "The sooner we know where she is, the quicker we will escape from this place... I am getting concerned."