In 2014 and 2015, hydrogen sulfide (H 2 S) at extremely high pressures (around 150 gigapascals) was first predicted and then confirmed to be a high-temperature superconductor with a transition temperature of 80 K. Additionally, in 2019 it was discovered that lanthanum hydride (LaH 10) becomes a superconductor at 250 K under a pressure of 170 gigapascals.