Chris Ryan 
Alpha Force: Black Gold 
Book 9

Target: Assassin!
The five members of Alpha Force are training in the Caribbean when an oil tanker runs aground, spilling oil – black gold – into the seas.
Diving down to the stricken tanker, Alpha Force soon discover that all is not as it seems. But they will need all their skills and ingenuity – powerboating, scuba diving, jet skiing – when a bomb explodes and an assassin strikes . . .
High-octane thrills from a master of adventure, bestselling author, TV presenter and an ex-SAS hero CHRIS RYAN.
Includes Chris Ryan”s top SAS tips on Safety and Survival in and around water.