An Attack Or An Accident?

How does a state of the art warship fail to detect a slow-moving cargo ship? Was this an attack or an accident? Was there any evasive action that could have been taken? What is the navy’s mission in the 21st century? Dan & Amy asked Admiral James Stavridis, former Supreme Allied Commander of NATO and author of Sea Power: The History and Geopolitics of the World’s Oceans.