Navy Lieutenant Jack Downes, Mobile Diving and Salvage Unit (MDSU)-1, San Diego, California, hands a video camera in water proof housing to diver, Electricians Mate First Class (EM1) (DV) Steven Lillie, MDSU-1 220 during Exercise NORTHERN EDGE 01. An extreme weather exercise, NORTHERN EDGE is Alaska's premier joint training exercise involving military units from all over North America during a two weeks period. This is the first time the divers have been able to use the camera to survey beneath the surface