Words: 900-1,300 Headwords
Brothers Dan and Roger Hunt are part of an expedition to study marine life in the South Seas. They dive under the sea, studying the amazing undersea life and finding treasure on old ships lying on the seabed. But a nasty character called Skink is also on the expedition, and he has no conscience. He wants to control the expedition at any cost. The boys soon understand that Skink is more dangerous than all the dangerous creatures under the sea.