I have no idea. I am afraid the detailed information is not available to the public. But I did find liquid nitrogen related to the manufacturing facility 50.
Building 50 is located in an industrial area of the facility. The storage tanks “N” Liquid Nitrogen, (PH) Pharmaceutical Nitrogen, “A” Argon and “B” Brine are all products required for use by the building occupants and not considered to be visually intrusive