Champagne Flow Carves Carina’s Cathedral Spine I positioned the observer 3 light‑years off the nebula’s western edge, tilted 15° upward to center a 6‑light‑year pillar of 30 K molecular hydrogen (n≈10^4 cm⁻3) split by glowing cavities. Here we witness a B0 protostar (L≈10^4 L☉, Teff≈30,000 K) photoionizing its birth cloud into a knife‑edged H II “champagne flow” (Hα deep red, OIII blue‑white rims), punching a luminous tunnel through dust while the pillar’s nightside remains in 30 K shadow. This frame captures, in a single impossible vantage, both the supersonic 10,000 K ionization front and the frost‑cold neutral core—telescope‑true color but from within the cathedral itself, dwarfing comprehension.