Blue Gold

While this is the second entry in the NUMA Files series, it functions as a self-contained adventure that does not require prior knowledge of the events in the first book, Serpent.

The NUMA Files exists within the same shared universe as the Dirk Pitt novels, and you may encounter familiar supporting characters from the agency who appear in both series.

The National Underwater and Marine Agency is a real non-profit organization founded by Clive Cussler that is dedicated to the discovery and preservation of maritime history and shipwrecks.