The Hiroshima anniversary comes as Japan faces a nuclear crisis of a different kind at the Fukushima Daiichi power plant that was battered by an earthquake and tsunami in 2011. Groundwater contaminated with high levels of radiation has breached an underground barrier meant to contain it, fueling concerns it could reach the surface of the ground and accelerate the leaks. A nuclear watchdog official told Reuters, “Right now, we have an emergency.”