What is the most expensive workers comp claim?

Can you enlighten me on the costliest workers' compensation claim ever recorded? I'm fascinated to know which incident or injury led to such an astronomical sum, and what measures might have been put in place to prevent such a significant financial burden on the company or insurer. Is there a particular industry or type of work that tends to see higher-than-average compensation claims? Additionally, how does the insurance industry adjust their premiums and risk assessments in the aftermath of such high-profile claims?