Summarized in this paper are the basic naval architectural aspects of recent attack submarine designs. In a brief historical section each submarine discussed is placed in its proper chronological setting. It is shown that volume and deck-area considerations are even more important than those of weight in establishing dimensions of current submarines. The over-all favorable aspects of single-screw body revolution submarines with particular regard to improved propulsive characteristics, smaller size and enhanced maneuverability submerged are demonstrated. Volume and weight requirements of diesel-electric versus nuclear power are discussed along with the large space demands made by improved electronic equipment and by present-day habitability standard~. The vital function of permanent fixed ballast needed for stability, space requirements, allowance for design error and allowance for future growth is clarified. An attempt is made in the structural section to develop a measure of the relative efficiencies of different designs. Considerable discussion is devoted to the stability and control of present-day high-speed submarines and it is concluded that excellent motion stability characteristics can be made to be quite compatible with rapid entry and exit from radical maneuvers. Finally, a limited look into the future with respect to the relatively incompatible features of reducing submarine size and increasing operating depths is undertaken.