Why do you think they would be dead if they saw Cherenkov radiation? It's a matter of depth: if the radioactive material was deep in the pond, they should be fi

Why do you think they would be dead if they saw Cherenkov radiation? It's a matter of depth: if the radioactive material was deep in the pond, they should be fine. I could see the Cherenkov radiation (indeed blue and not green) when I visited the Cattenom nuclear power plant [1] two decades ago: it was used nuclear fuel (uranium rods) stored at the bottom of a 50 meters deep pool. There was nothing between us (visitors) and the pool. 50 meters of water is pretty good insulation from radioactivity. [1] https://en.wikipedia.org/wiki/Cattenom_Nuclear_Power_Plant https://en.wikipedia.org/wiki/Cattenom_Nuclear_Power_Plant