Iceberg by Clive Cussler was the second book to be published by the bestselling author and came out in 1975.
It was originally the second book in the series featuring Dirk Pitt, but subsequently became the third book in the series chronologically following the release of Pacific Vortex!
Iceberg book description
The towering iceberg drifting in the North Atlantic was a floating tomb.
Embedded in the great gleaming mass was a ship – sealed in so solidly that not even its mast protruded.
Here was a sea mystery to rank alongside the Bermuda Triangle and the Marie Celeste. But for Major Dirk Pitt, top troubleshooter for the National Underwater and Marine Agency, it was also the first link in a fantastic chain of events that would lead him too close – and too often – to violent death.
And to the discovery of the most sinister and bizarre conspiracy of the century… ICEBERG.