# Substrate-Relative Habitability **Domain:** Habitat / Post-Biological Civilization **Substrate-Relative Habitability** is the principle that a viable environment is defined relative to the material, energetic and informational requirements of the intelligence or archive being sustained. Biological people require pressure, temperature, water, nutrients and radiation protection. Executable persons require power, compute, cooling, storage integrity, bandwidth and repairable hardware. A place lethal to organisms may be habitable for an archive, while a biologically comfortable environment may be computationally unstable or energy-poor. _Pantheon_ uses this inversion to imagine post-biological migration and Dyson-scale world-building. The point is not that digital life escapes matter. It changes which matter matters. Machines may travel where bodies cannot, but they still depend on thermodynamics, error correction and infrastructure. This idea connects continuity to planetary limits and succession. A post-biological habitat is not metaphysical immortality; it is another ecological niche with different failure conditions. Related: [[wiki/Energetic Sovereignty|Energetic Sovereignty]], [[wiki/Post-Humanism|Post-Humanism]], [[articles/We Were Never Going to Make It|We Were Never Going to Make It]], [[articles/The Desiccative Succession|The Desiccative Succession]].