18 



FIGURE 2.1 TETHERED, FREE-SWIMMING ROV GROWTH 



1950 5152 53 54 55 56 57 58 59 1960 61626364 65 66 67 68 69B70 7172 73 74 75 7677 78 79 1980 

 (Underscored vehicles denotes Government or scientific/research- funded vehicles) 



