projects involving high risk and liability include a Factor of Safety https://en.wikipedia.org/wiki/Factor_of_safety https://en.wikipedia.org/wiki/Factor_of_sa

projects involving high risk and liability include a Factor of Safety https://en.wikipedia.org/wiki/Factor_of_safety https://en.wikipedia.org/wiki/Factor_of_safety i believe they did their calculus here though, and as long as the cost/benefit of this once-in-10-years event is amortized across 10 years...