The Troll A platform has an overall height of , weighs 683,600 tons (1.2 million tons with ballast)[REF] and has the distinction of being the tallest and heaviest structure ever moved by mankind.
The four legs are joined by a "chord shortener", a reinforced concrete box interconnecting the legs, but which has the designed function of damping out unwanted potentially destructive wave-leg resonances by retuning the leg natural frequencies [REF].