NASA astronaut Chris Williams inserts a cryogenic storage unit into a science freezer

iss074e0590846 (May 12, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams inserts a cryogenic storage unit, called a dewar, into a science freezer aboard the International Space Station’s Kibo laboratory module. Earlier, Williams had loaded the dewar with ice bricks that help keep scientific samples extremely cold inside the ultra‑cold freezer, known as the Minus Eighty‑Degree Laboratory Freezer for the International Space Station, or MELFI.