Book Six in Gary Paulsen's World of Adventure Series.
Enter Gary Paulsen's action-packed world of danger and excitement - where you've got to be tough to survive . . .
'Tag jerked his arm out and swam back. The pain was worse than a thousand sharp needles all jabbed into his hand at once. A greenish fluid surged from the end of his thumb. Tag knew it was the colour of his own blood.'
Somewhere in the dark ocean lies the treasure-filled wreck of a ship. Tag's dad died searching for it - and now it's his turn to explore the deep. But the seabed holds a terrifying secret - worth more than silver or gold . . .
