When you watch NCIS: New Orleans Season 2 Episode 23 online, you join the team as they investigate the sudden death of a Navy master diver, who washes up after being killed in the most unlikely place -- the ocean. The team soon partners with the Department of Homeland Security in the form of Agent Russo, who previously helped Brody investigate the leak in Washington, D.C., and is currently in New Orleans to set up a DHS office to investigate an as-yet amorphous threat to the area. At first, it's unclear what the murdered Navy diver has to do with the imminent attack on the city, but when they discover camera footage of the diver being run over by a submarine, things really begin to take off. Unfortunately, there are way too many questions left unanswered, and the threat is only drawing closer and growing more and more deadly. Who was piloting the submarine? What were they doing? Why did they target the master diver? And how is it all linked with the threat that Russo is investigating? And, naturally, is Russo in town just to set up the DHS office, or is he actually there to seduce Brody? Find out the answers when you watch NCIS: New Orleans Season 2 Episode 23 online!