In the case of forged steel cable, one would need 13 times the depth of water in 5 fathoms, but only 61 times the depth of water in 20 fathoms.
Kwimeko yentsontelo ezidityanisiweyo, omnye unokufunda amaxesha ali 13 kubunzulu bamanzi, kodwa kwi 61 bamaxesha kubunzulu bamaxesha kwi 20 ngoko mlinganiselo.