Dr. Marcus Webb is the ALSO Habitat Systems Chief Engineer at NASA Johnson Space Center. In an August 2031 interview with Ars Technica, he provided the defining engineering-level articulation of the structural constraint that shaped NASA’s lunar surface presence: ALSO is not buried — it uses surface berming, a water-wall belt, and dose-budget rotation — because full subsurface placement was fiscally unattainable within the appropriations cycle.
His observation on the ALSO-Zvezda shielding divergence — “If your national commitment horizon is thirty years and your budget authority doesn’t reset every two, you dig the trench. If it’s neither of those things, you build what you can build with the launches you can actually get appropriated, and you manage the dose instead of eliminating it. That’s not a failure of engineering. It’s what the constraint set produces” — is the engineering-level parallel to Osei’s “compounded constraint” thesis (2031) and the CRS lunar capability gap assessment (2036). The dose-budget rotation that ALSO crews operate under is not a design choice; it is what the constraint set produces.