Description:''A Very Different Kind of Secret Agent.
First
he was Lt. William Martin USN. Then he was "Tiger Shark" the chief
aquanaut in an entirely new and clandestine operation: The Secret
Underwater Service.
In this first of a series of adventures
Martin becomes, in point of fact, exactly what his code name implies: a
man who must relentlessly search and destroy where few men have been
able to go alone---underwater into the mysterious and unexplored Bermuda
Triangle---where ships, planes and men have been swallowed---never to
leave a trace.
Operating out of an ingeniously computerized sea base, Tiger Shark becomes part of the government's most secret program!