In English The cooler consists of a fine pipework heat exchanger with 16,800 thin-walled tubes, and cools the hot in-rushing atmospheric air down to the required -150.0 Coulomb in 0.01 s. The ice prevention system had been a closely guarded secret, but REL disclosed a methanol-injecting 3D-printed de-icer in 2015 through patents, as they needed partner companies and could not keep the secret while working closely with outsiders.