Illustration
A half-mile-long stretch of tunnel in Menlo Park, California is now colder than most of the universe.
![LCLS-II cooldown](/sites/default/files/styles/card/public/lclsII_cooldown_pr_la_final.jpg?h=5a5fc591&itok=CDVMK27F)
![Cryoplant flow animation](/sites/default/files/lclsII_cooldown_pr_sv_flow_anim_final.gif)
![SLAC's Tien Tan, left, and Kathleen Ratcliffe pose for a portrait outside a SLAC building.](/sites/default/files/styles/card/public/2021_1115_Kathleen_Ratcliffe_Tien_Tan_Portraits_Orrell-10%20web%20version.jpeg?h=72b1671e&itok=SBr43KPI)
Photograph
Last cryomodule unload, #41 from Fermilab F1.3-06. This one will be one of a few spares for LCLS-II.
![Last cryomodule unload, #41 from Fermilab F1.3-06. This one will be one of a few spares for LCLS-II.](/sites/default/files/styles/card/public/2022-10/2021_0519_Last_Cryomodule_Delivery_Orrell-14.jpg?h=0152c0a0&itok=dceDAZc8)