This article is about a failure that was entirely predictable, entirely preventable, and entirely hidden until it was not. Dean Anson Sanderson's death during a zipline ride in Far North Queensland clearly falls into that category, a termination failure that exposes how superficial assurance and visual checks can lull organisations into thinking life-critical systems are safe. In December 2019, a zipline cable failed mid-span in the Daintree region, sending two riders plungi