Thanks. From the Nature paper cited in TFA:[0] > Here we use laser-driven shockwaves to simultaneously compress and heat liquid water samples to 100–400 gigapa

Thanks. From the Nature paper cited in TFA:[0] > Here we use laser-driven shockwaves to simultaneously compress and heat liquid water samples to 100–400 gigapascals and 2,000–3,000 kelvin. And in the phase diagram that you cited, it stays at ice XVIII over the whole temperature range. 0) https://www.nature.com/articles/s41586-019-1114-6 https://www.nature.com/articles/s41586-019-1114-6