https://www.vice.com/en_us/article/v7vx93/scientists-conducting-nuclear-fusion-tests-deep-under-a-mountain-discover-secrets-of-first-stars

Scientists have opened an unprecedented window into the universe’s very first stars by conducting nuclear fusion experiments in a subterranean laboratory located 1.5 miles under China’s Jinping Mountains, reports a new study. 

The results resolve a longstanding mystery about one of the oldest stars ever discovered, while also shedding new light on the murky reactions that powered the ancestors of all modern stars.