National Geographic : 1986 Dec
Above the wreck site, divers David Sanders and John Salzig (left) stand atop Alvin to secure safety lines that buttress JasonJr.'s garage as the vehicles are lifted out of the water to the support ship's deck. Launched at Woods Hole in 1964, Alvin has been a reliable sea dog, logging more than 1,700 dives. It has proved invaluable in geologic and biologic studies during descents as deep as 13,000 feet. Alvin's smaller partner, called J. J. for short, measures just 28 inches long and weighs 250 pounds on land. But its hull of syntactic foam billions of microscopic air filled glass spheres bonded by epoxy-makes it weightless in water. A 200-foot-long tether connects the two vehicles, enabling Alvin's crew to send J. J. into spaces too small or too dangerous for a manned vehicle. Woods Hole scientists are at work on J. J.'s successor, to be named simply Jason. Larger and more sophisticated than its predecessor, Jasonwill include robot arms for retrieving samples. A K ,a with strobe. 2 Manipulator iTithlights video cameras. 3 Cable winp d reel. Sonar. 5 Hatch. 6 Titaniupwsphere Viewii Je 'onable iron ballast 9 Acoustic te hc bitt. Tanks for rand variableseawa Batteries 3 Presure housings for electric Thrusters Emergency tether cutter. )king l9wighNevel black-and-white TV Forard-lookingolpw-light-level black-and-, ~BtsD~ I 11 ..