The NDIA Undersea Warfare Division was tasked by the US Navy, Director Sea Shield, OPNAV, N87 to formulate new DNS concepts to hold enemy forces at risk, to secure a friendly maneuver area, and to assure access world‐wide. The new DNS concepts are focused on the Port Egress and Sea Base scenarios, end‐points in the spectrum of ASW operations. The threat comprises a large number of widely dispersed, quiet, diesel‐electric, AIP, and nuclear submarines in the year 2015. The study team established that new DNS concepts derive advanced capability from expansion of four critical DNS functions: Deployment, sensing, communications, and C2. Seven Port Egress and five Sea Base concepts are each described including: An operating concept, identification of critical components, description of capabilities that each concept offers, and a functional binning diagram. The new DNS concepts were ranked and scored on a set of ASW utility attributes specific to either the port egress or sea base scenario. Concepts were evaluated for potential reductions in the detect to engage sequence and enabling technologies were identified. The study summary, conclusions, and recommendations were presented to the Chairman, ASW Cross‐Functional Board, RADM C. Van Mauney on 5 June 2007.