NASA astronaut Jonny Kim stows research samples inside a cryogenic storage unit

iss073e0135008 (May 29, 2025) --- NASA astronaut and Expedition 73 Flight Engineer Jonny Kim stows research samples inside a cryogenic storage unit for installation inside a science freezer for preservation inside the International Space Station's Destiny laboratory module. Offically called the Minus Eighty-Degree Laboratory Freezer for ISS, or MELFI, the ultra-cold storage unit enables space biology research by preserving biological samples for analysis including blood, saliva, urine, microbes, and more.