Meet Crank and Al ... robots on the run.

They arrive at the ancient city of Tarka, a flooded city behind a great wall. Hoping to discover Robotika, where robots can be free, instead they end up trapped between the mysterious underwater Aquanauts and the cruel Crodilus ...

A refreshed cover look for this well-loved series, illustrated by the incomparable Mark Oliver. Read on with The Tin Man, Tunnel Racers, Razorbites, Powerball and The Ghost Sea.

This is book 6 in Robo-Runners .

This book has been graded for interest at 7-9 years.

There are 112 pages in this book. This book was published 2013 by Hodder & Stoughton General Division .

Nicola Moon lives in Swindon. She has written several books for young children, including the best-selling Lucy's Picture. Mark Oliver is a very successful illustrator who has previously illustrated Speak Up Spike, a Go Yellow Banana by Franzeska G. Ewart. Damian Harvey has worked as a hospital radio presenter, painter-decorator, and swimming instructor, as well as writing several books for children. He lives in Blackpool, Lancashire.