Death Dive

Description for DEATH DIVE by Irving A Greenfield:

Far below the threatening seas, America's secret high technology submarine, the Shark, is racing toward a deadly confrontation with a Soviet killer sub.  They both hope to salvage an incalculable fortune in gold from an ancient wreck---or join that ill-fated ship forever on the ocean bottom.  But the Shark, with its unique capabilities and hand-picked crew, seems ready for anything---except treachery!  There's a leak somewhere and it isn't in the sub's hull.  If the Shark's existence ever becomes know, it would mean the death of every man aboard.  And with the Russians ahead and a turncoat within, the Shark's next crash dive might be its last!

This is #2 in Depth Force Series.