Elon Musk says a SpaceX Starship prototype has passed a critical “cryo proof” test for the first time, opening the door for the rocket to move on to even bigger tests. A SpaceX Starship prototype successfully passed a cryo pressure test that claimed the claimed the lives of several of its predecessors. SpaceX’s future deep-space rocket passes key test, paving the way for short flight New, 23 comments Finally, a Starship prototype survives a cryo test SpaceX’s first full-scale Starship prototype – Mk1 – has experienced a failure at its Boca Chica test site in southern Texas. SpaceX's Starship prototype, SN4, passed a key cryogenic proof test late Sunday evening and will undergo more critical tests this week. Starship SN4 became SpaceX’s first full-scale Starship prototype to pass a cryogenic proof test on Sunday evening at SpaceX’s launch site in Boca Chica, Texas.