They literally left his body hanging in iron chains above the river for years just to let the changing tides systematically rot his flesh. In the execution of high-seas convicts under Admiralty law, the English monarchy used an incredibly slow method of public terror called gibbeting. Instead of a quick noble burial after a hanging at Execution Dock, the executioners covered the corpse in thick tar to preserve it against the weather and encased it in a tight, custom-fit iron cage. They hoisted the cage high onto a wooden post right at the low-water mark of the River Thames. For three consecutive tides, the rising water completely submerged the body, turning the major shipping lane into a graphic warning system that every single merchant sailor was forced to stare at as they entered London.
Interesting Fact The execution of Captain Kidd in 1701 was specifically designed to be an extreme public spectacle. His rope actually snapped during the first hanging attempt, forcing the panicked executioners to drag him back up the steps and hang him a second time before sealing his body into the iron gibbet frame where it remained swinging in the wind for over two years.
