The Black Shark gaming phone comes with totally unique features that include a 550 nits 5.99-inch display, special detachable game controller, sturdy back design for improved grip, watercooling system that allows the SoC to run at lower temperatures and thus avoiding throttling, plus stereo speakers that emulate surround sound acoustics.
https://www.notebookcheck.net/Xiaomi-s-Black-Shark-gaming-phone-officially-revealed-with-liquid-cooling-solution.298688.0.html
Didn't Samsung do this same hilarious/dumb heat pipes=water cooling marketing BS with the S6 or S7? Anyhow, this is clearly a heatpipe cooler, which isn't really news in a high end phone. It looks like a rather beefy one, though, which would be good. Hopefully it contacts the rear shell directly and uses good thermal interface material at all contact points, although with stacked DRAM there's only so much you can do...