After chilling the lines for liquid oxygen (LOX), teams have begun the slow fill phase to load LOX into the Space Launch System (SLS) rocket’s core stage and have started chilling down the transfer line for the liquid hydrogen (LH2). Once LOX slow fill is complete, teams will transition to fast fill operations. Once the LH2 chilldown operations are complete, slow fill of liquid hydrogen will begin.

Follow along with live coverage and with the countdown milestones for the cryogenic demonstration test ahead of the Artemis I mission.

Core Stage Liquid Oxygen Chilldown Complete, Slow Fill Underway