' */ 'IS «.»' i ■ aw •» 



y^it \nst • • t* *■* 



llIU 



"~ 



Figure 2. Submersible Test Unit (STU) used by NCEL for studying the 



effects of the deep-ocean environment on construction materials. 



Figure 3. Model of a manned underwater structure developed by 

 General Dynamics. 



11 



