Oxygen-Sponge Alveoli

A paired alveolar sponge graft that stretches thin-air and recycled-bay breathing without a carried bottle. It does not make vacuum safe and it will not forgive a ripped suit. What it buys is time: longer work in thin pressure, fewer early HT hits when the scrubber coughs, and a quieter panic when the bay clock runs short. Fitting opens the chest wall, seats living foam that learns your breath pattern over a week, and leaves a flush port under the clavicle. Ashvein keeps ninety-day warranty telemetry; skip the flush and the sponge clogs with the same grit you were trying to outrun.