1     Dædalus Project Inc.  Home page.  [Online].  <http://www.daedalusproject.com/index.html>

        2    Heath Beres and Jeff Mattingly, CAVE Visualization and Modeling of the Phantom II Human-Powered Submarine.  Home Page.
                [Online].  <http://www.sv.vt.edu/classes/ESM4714/Student_Proj/class97/beres_mattingly/design/index.html>