"If the strings are 10 metres long and your down 4.5 kilometres then that is 450 lengths of very heavy steel that need to be handled."
If the tube is a 5.5 inch with a 0.375 inch wall it weighs approx 20.87 pounds (9.07) kgs per foot
4.7 klm's would weigh approx 145 tonnes
Ann: Lockyer Deep-1 Operational Update, page-153
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