ABSTRACT
For the pressure hull in underwater engineering, the general shape is mostly in the form of a ring-stiffened circular cylinder blocked by end caps, or a spherical hull. Because of the advantages and disadvantages of using a circular cylindrical shell as pressure hull, the main pressure hull in a toroidal form was suggested by Ross (2005, 2006), for the design of an underwater missile launcher and the underwater space station. With its special structural shape, the main pressure hull of a toroidal form can be constructed to obtain kinds of different function.
