Project Nemo examines the cognitive processes and representational structures used by submarine Commanders while attempting to locate an enemy submarine hiding in deep water. This report provides a precis of the first phase of this effort. Protocol data, collected from commanders with 20 years of submarine experience, have been transcribed and analyzed. The data suggest a shallow goal structure with a basic level of subgoals that are used by all Commanders throughout the task. Relatively few operators are required for each subgoal. The results are congruent with a schema theory interpretation in which the process of schema instantiation provides the control of cognition.