The custom-made liquid coolant is safe for the environment and also helps improve mining performance, energy efficiency plus reduce maintenance costs for the Antminer S19j ASIC machines. 8 MW worth of mining equipment will be submerged by February 2022, with the remaining 12 MW worth expected to go online throughout the remainder of the year. Hashrate should reach 600 PH/s.
https://www.notebookcheck.net/CleanSpark-will-submerge-5-940-Bitcoin-mining-rigs-in-liquid-coolant-to-improve-performance-and-energy-efficiency.584946.0.html