Rogue Fortress (Rogue Submarine Book 6)

Book 6 of the Rogue Submarine Series... Rogue Avenger (2005), Rogue Betrayer (2007), Rogue Crusader (2010), Rogue Defender (2013), Rogue Enforcer (2014), Rogue Fortress (2015), Rogue Goliath (2015).

IT BEGINS WITH GREED. IT ENDS WITH DESTRUCTION.
A military bid for control of the fourth richest oil fields on earth. A high-tech fortress, armed with cutting-edge rail guns and point defense weapons that give it mastery of the sea for more than 100 miles in all directions. An insanely-clever commando assault on a snorkeling diesel submarine. At the epicenter of these colliding forces is former U.S. Navy officer Jake Slate, scrabbling desperately for one more impossible military victory. And behind the scenes, international arms dealer Pierre Renard continues to pull the strings like the virtuoso puppet master he is.

In a world of dwindling fuel sources, the global battle for oil is just getting started…