Virtual Environment Training offers a cost effective alternative to high-priced simulators and training devices. It uses the advantages of multimedia technology to provide quick access to motivating video sequences, audio warnings, realistic images and detailed text and drawings to interactively train critical tasks. This paper will highlight a recent project completed at Newport News Shipbuilding to use Virtual Environment Training to improve performance of submarine crewmen. It will detail critical considerations in the use of Digital Video Interactive (DVI®) in Virtual Environment Training. This paper will also identify a Virtual Environment Training development process and highlight a software application that was developed to aid in training design. Finally, significant performance improvements from a recent test/evaluation of this virtual environment part-task trainer will be discussed.