American submarine NR-1NR-1 aka Nerwin was the smallest submarine the United States used that had wh
American submarine NR-1NR-1 aka Nerwin was the smallest submarine the United States used that had wheels to traverse the ocean floor.NR-1 was used for espionage as well as research and salvage operations that included searching the wreckage of the Space Shuttle Challenger and the HSHS Britannic. -- source link
#united states#military#armed forces#submarine#cold war#espionage#science#technology#research#america#sailor#soldier#history#photograph#grayscale#photos#vintage#general dynamics#challenger#battle