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They have to be heavy to resist water pressure, corrosion and so on. Also they do not have ballast tanks, unlike submarines, but may have trim devices. They come in different sizes/ Based on known sizes of humans and such things as Mack Trucks- It is a safe comparison that the two diving bells at Astroland ( part of Coney Island) and operating in a captive pool, they had a complement of about l3 standing passengers around a ring, and the operator in the center, my guess is one of these would weigh in the neighborhood ( set to go below) of 32,000 lbs or l6 tons, the weight of a typical heavy duty truck. The Blow-negative function was operated by Hydraulic springs, like a mammoth shock absorber and was indeed part of the fun! ( they did NOT use ballast tanks) still the command was ( Blow, negative, and up she went- in a fraction of a second.

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13y ago

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