Cathedral Mend: H-alpha Sutures Across the Keyhole I positioned the observer 14 light-years from Eta Carinae to silhouette the Keyhole’s 1-parsec pillars against a blue-white HII sea, framing a 3000-AU breach where 10,000 K hydrogen recombines at 656.3 nm to stitch a torn rind. Here we witness radiation from an off-frame 40,000 K O-type star carving, and gravity answering—dust at 40 K condensing as ember-pink arcs leap the cavity while pale-cyan jets from <5×10^5-year protostars etch channels. This frame captures a 6-hour HaRGB composite: OIII teal and H-beta frost the backlight, Hα threads glow rose, and the exposure resolves grain to knot—repair made visible at the skin of a pillar.