Immediate question: night hems to non pre surveyed sites, safe initial approach and landing aside, even if using NVG, how easy in reality is it to mitigate the risk of wires? Given how this was missed with multiple tools and attempts to survey on the ground. Despite crews best efforts it still happened. I’m referring to the overall need for this level of risk, not crew actions which it appears were in keeping with OMA/OMC procedures.