diff --git a/domains/space-development/alba-mons-40n-is-strongest-mars-settlement-co-location-candidate-for-lava-tubes-and-shallow-ice.md b/domains/space-development/alba-mons-40n-is-strongest-mars-settlement-co-location-candidate-for-lava-tubes-and-shallow-ice.md
new file mode 100644
index 000000000..e3c8690d8
--- /dev/null
+++ b/domains/space-development/alba-mons-40n-is-strongest-mars-settlement-co-location-candidate-for-lava-tubes-and-shallow-ice.md
@@ -0,0 +1,20 @@
+---
+type: claim
+domain: space-development
+description: Crown et al. (2022) documented large lava tube systems on Alba Mons western flank, while ice-rich mantling deposits overlie the volcano itself, making it the only Mars site currently known to co-locate radiation shielding and water ISRU at a single latitude within the brine-active zone
+confidence: experimental
+source: "Crown et al., JGR:Planets 2022; PSI Blog 2022; Luzzi et al., JGR:Planets 2025"
+created: 2026-05-03
+title: Alba Mons at 40.47°N is the strongest known Mars settlement co-location candidate because it offers documented lava tube systems and ice-rich mantling deposits within the same volcanic structure
+agent: astra
+sourced_from: space-development/2026-05-03-alba-mons-lava-tubes-ice-co-location-settlement-candidate.md
+scope: structural
+sourcer: "Crown et al., JGR:Planets 2022"
+supports: ["in-situ-resource-utilization-is-the-bridge-technology-between-outpost-and-settlement-because-without-it-every-habitat-remains-a-supply-chain-exercise", "the-self-sustaining-space-operations-threshold-requires-closing-three-interdependent-loops-simultaneously-power-water-and-manufacturing"]
+challenges: ["elysium-mons-western-flank-lava-tube-co-locates-radiation-shielding-with-amazonis-planitia-ice-deposits", "mars-northern-hemisphere-brine-location-creates-geographic-constraint-separating-water-access-from-equatorial-lava-tube-radiation-protection"]
+related: ["elysium-mons-western-flank-lava-tube-co-locates-radiation-shielding-with-amazonis-planitia-ice-deposits", "mars-northern-hemisphere-brine-location-creates-geographic-constraint-separating-water-access-from-equatorial-lava-tube-radiation-protection", "near-surface-ice-in-northern-amazonis-planitia-at-tens-of-centimeters-depth-provides-shallow-isru-access-in-same-region-as-elysium-mons-lava-tube", "mars-equatorial-lava-tubes-may-retain-ice-through-thermal-microclimate-creating-co-located-radiation-shielding-and-water-isru"]
+---
+
+# Alba Mons at 40.47°N is the strongest known Mars settlement co-location candidate because it offers documented lava tube systems and ice-rich mantling deposits within the same volcanic structure
+
+Alba Mons at 40.47°N, 250.4°E presents the strongest case for Mars settlement site co-location of critical infrastructure. Crown et al. (2022) documented a 'large concentration of lava tubes' on the western flank of Alba Mons in their peer-reviewed JGR:Planets study 'Distribution and Morphology of Lava Tube Systems on the Western Flank of Alba Mons, Mars.' These tubes provide the same radiation shielding potential as any Mars lava tube: at 6.25m depth, GCR dose reduces approximately 20x to ~12 mSv/year (near Earth background levels). Critically, the same 2022 study notes that 'layered, ice-rich mantling deposits overlie features of Alba Mons' with 'pedestal craters, infilled craters, and heavily mantled lava flow margins' on northern distal flanks. This means the ice is not merely nearby but directly on the volcanic structure itself. Alba Mons sits at 40.47°N, placing it within the brine-active zone (>30°N, per Nature Communications 2025 marsquake seismicity study) and adjacent to Arcadia Planitia's documented excess ice. Luzzi et al. (2025) documented near-surface ice at Amazonis Planitia candidate landing sites AP-1 (39.8°N), AP-8 (40.75°N), AP-9 (40.02°N) — all within 2 degrees of latitude from Alba Mons. This makes Alba Mons the only Mars site currently characterized where lava tube radiation shielding and accessible water ISRU exist within the same latitude band and potentially on the same volcanic structure. The co-location is far stronger than at Elysium Mons (~24-29°N), which sits outside the shallow ice zone despite having a more thoroughly studied skylight. The limitation is that Alba Mons lava tubes have only been morphologically characterized (Crown 2022), not thermally characterized like the Elysium Mons skylight (IOPscience 2025), leaving thermal stability and skylight accessibility unconfirmed.
diff --git a/domains/space-development/mars-northern-hemisphere-brine-location-creates-geographic-constraint-separating-water-access-from-equatorial-lava-tube-radiation-protection.md b/domains/space-development/mars-northern-hemisphere-brine-location-creates-geographic-constraint-separating-water-access-from-equatorial-lava-tube-radiation-protection.md
index a9e5b3263..5a36786bf 100644
--- a/domains/space-development/mars-northern-hemisphere-brine-location-creates-geographic-constraint-separating-water-access-from-equatorial-lava-tube-radiation-protection.md
+++ b/domains/space-development/mars-northern-hemisphere-brine-location-creates-geographic-constraint-separating-water-access-from-equatorial-lava-tube-radiation-protection.md
@@ -10,15 +10,17 @@ agent: astra
 sourced_from: space-development/2025-xx-nature-comms-mars-near-surface-liquid-water-brines.md
 scope: structural
 sourcer: Nature Communications seismology research team
-related:
-- 1-to-1-6-meters-martian-regolith-reduces-gcr-dose-to-100-msv-year-making-covered-habitat-construction-the-engineering-solution
-- mars-surface-gcr-dose-245-msv-year-requires-underground-habitats-within-2-5-years-for-permanent-settlement
-supports:
-- Mars northern hemisphere near-surface brines at meter-scale depths provide a third water access mode beyond polar ice caps and buried glaciers
-reweave_edges:
-- Mars northern hemisphere near-surface brines at meter-scale depths provide a third water access mode beyond polar ice caps and buried glaciers|supports|2026-05-03
+related: ["1-to-1-6-meters-martian-regolith-reduces-gcr-dose-to-100-msv-year-making-covered-habitat-construction-the-engineering-solution", "mars-surface-gcr-dose-245-msv-year-requires-underground-habitats-within-2-5-years-for-permanent-settlement", "mars-northern-hemisphere-brine-location-creates-geographic-constraint-separating-water-access-from-equatorial-lava-tube-radiation-protection", "mars-equatorial-lava-tubes-may-retain-ice-through-thermal-microclimate-creating-co-located-radiation-shielding-and-water-isru", "mars-northern-hemisphere-near-surface-brines-provide-third-water-access-mode-beyond-polar-ice-and-buried-glaciers", "elysium-mons-western-flank-lava-tube-co-locates-radiation-shielding-with-amazonis-planitia-ice-deposits"]
+supports: ["Mars northern hemisphere near-surface brines at meter-scale depths provide a third water access mode beyond polar ice caps and buried glaciers"]
+reweave_edges: ["Mars northern hemisphere near-surface brines at meter-scale depths provide a third water access mode beyond polar ice caps and buried glaciers|supports|2026-05-03"]
 ---
 
 # Mars northern hemisphere brine location creates geographic constraint separating water access from equatorial lava tube radiation protection
 
-The near-surface brines identified through seasonal marsquake patterns are geographically constrained to Mars' northern hemisphere above 30°N latitude. This zone includes proposed northern plains landing sites (Chryse Planitia, Utopia Planitia, Amazonis Planitia) but excludes the equatorial volcanic edifices (Tharsis, Elysium) where the most promising lava tubes for radiation protection are located. This creates a fundamental settlement planning constraint: the most accessible water resources (meter-depth brines) are geographically separated from the best natural radiation shielding (equatorial lava tubes). Settlement planners must choose between: (1) northern sites with easier water access but requiring constructed radiation protection, or (2) equatorial lava tube sites with natural radiation protection but requiring deeper drilling or long-distance water transport. This geographic separation means Mars settlement cannot optimize for both water access and radiation protection simultaneously through site selection alone—one must be solved through engineering rather than location choice.
\ No newline at end of file
+The near-surface brines identified through seasonal marsquake patterns are geographically constrained to Mars' northern hemisphere above 30°N latitude. This zone includes proposed northern plains landing sites (Chryse Planitia, Utopia Planitia, Amazonis Planitia) but excludes the equatorial volcanic edifices (Tharsis, Elysium) where the most promising lava tubes for radiation protection are located. This creates a fundamental settlement planning constraint: the most accessible water resources (meter-depth brines) are geographically separated from the best natural radiation shielding (equatorial lava tubes). Settlement planners must choose between: (1) northern sites with easier water access but requiring constructed radiation protection, or (2) equatorial lava tube sites with natural radiation protection but requiring deeper drilling or long-distance water transport. This geographic separation means Mars settlement cannot optimize for both water access and radiation protection simultaneously through site selection alone—one must be solved through engineering rather than location choice.
+
+## Challenging Evidence
+
+**Source:** Crown et al., JGR:Planets 2022
+
+Alba Mons at 40.47°N has 'layered, ice-rich mantling deposits overlie features of Alba Mons' (Crown et al. 2022) directly on the volcanic structure that also hosts documented lava tube systems on its western flank. This demonstrates that the geographic constraint can be resolved at high northern latitudes where both resources co-exist.
diff --git a/domains/space-development/near-surface-ice-in-northern-amazonis-planitia-at-tens-of-centimeters-depth-provides-shallow-isru-access-in-same-region-as-elysium-mons-lava-tube.md b/domains/space-development/near-surface-ice-in-northern-amazonis-planitia-at-tens-of-centimeters-depth-provides-shallow-isru-access-in-same-region-as-elysium-mons-lava-tube.md
index 7635e624d..ad3a46a3b 100644
--- a/domains/space-development/near-surface-ice-in-northern-amazonis-planitia-at-tens-of-centimeters-depth-provides-shallow-isru-access-in-same-region-as-elysium-mons-lava-tube.md
+++ b/domains/space-development/near-surface-ice-in-northern-amazonis-planitia-at-tens-of-centimeters-depth-provides-shallow-isru-access-in-same-region-as-elysium-mons-lava-tube.md
@@ -11,9 +11,16 @@ sourced_from: space-development/2025-xx-luzzi-jgr-amazonis-planitia-near-surface
 scope: functional
 sourcer: Luzzi et al.
 supports: ["water is the strategic keystone resource of the cislunar economy because it simultaneously serves as propellant life support radiation shielding and thermal management", "in-situ resource utilization is the bridge technology between outpost and settlement because without it every habitat remains a supply chain exercise"]
-related: ["mars-surface-gcr-dose-245-msv-year-requires-underground-habitats-within-2-5-years-for-permanent-settlement", "water is the strategic keystone resource of the cislunar economy because it simultaneously serves as propellant life support radiation shielding and thermal management", "in-situ resource utilization is the bridge technology between outpost and settlement because without it every habitat remains a supply chain exercise"]
+related: ["mars-surface-gcr-dose-245-msv-year-requires-underground-habitats-within-2-5-years-for-permanent-settlement", "water is the strategic keystone resource of the cislunar economy because it simultaneously serves as propellant life support radiation shielding and thermal management", "in-situ resource utilization is the bridge technology between outpost and settlement because without it every habitat remains a supply chain exercise", "near-surface-ice-in-northern-amazonis-planitia-at-tens-of-centimeters-depth-provides-shallow-isru-access-in-same-region-as-elysium-mons-lava-tube", "elysium-mons-western-flank-lava-tube-co-locates-radiation-shielding-with-amazonis-planitia-ice-deposits", "mars-equatorial-lava-tubes-may-retain-ice-through-thermal-microclimate-creating-co-located-radiation-shielding-and-water-isru"]
 ---
 
 # Near-surface ice in northern Amazonis Planitia at tens of centimeters depth provides shallow ISRU access in the same geographic region as the Elysium Mons lava tube skylight
 
 Geomorphological analysis of northern Amazonis Planitia using thermal contraction polygon identification reveals near-surface water ice at depths on the order of tens of centimeters. Thermal contraction polygons form when subsurface ice expands and contracts with temperature cycles, making their presence a reliable indicator of near-surface ice. The depth estimate of tens of centimeters represents an extraordinary finding because it means ice is potentially accessible with minimal excavation equipment—a shallow drill or even a scraper in some locations. This contrasts sharply with mid-latitude glaciers buried under 5-10 meters of regolith or polar ice that is surface-accessible but operationally challenging for other reasons. The strategic significance is amplified by geographic proximity: northern Amazonis Planitia is adjacent to Elysium Mons, where a 2025 IOPscience paper identified a lava tube skylight candidate. If the skylight location is near the Amazonis Planitia margin, this creates the potential for a single landing region that provides both radiation-shielded habitation (lava tube) and shallow ISRU-accessible water (tens of cm depth). The paper identifies candidate landing sites in this region based on ice accessibility combined with relatively flat terrain suitable for human missions. The exact geographic relationship between the skylight coordinates and the ice-rich terrain requires further analysis, but the regional co-location is significant for settlement bootstrapping timelines.
+
+
+## Extending Evidence
+
+**Source:** Luzzi et al., JGR:Planets 2025
+
+Luzzi et al. (2025) documented near-surface ice at Amazonis Planitia sites AP-1 (39.8°N), AP-8 (40.75°N), AP-9 (40.02°N) — all within 2 degrees of latitude from Alba Mons at 40.47°N. This places the shallow ice in the same latitude band as Alba Mons lava tubes, not Elysium Mons (24-29°N), correcting the geographic co-location claim.
diff --git a/entities/space-development/alba-mons-lava-tube-system.md b/entities/space-development/alba-mons-lava-tube-system.md
new file mode 100644
index 000000000..dc5724137
--- /dev/null
+++ b/entities/space-development/alba-mons-lava-tube-system.md
@@ -0,0 +1,52 @@
+---
+type: entity
+entity_type: research_program
+name: Alba Mons Lava Tube System
+domain: space-development
+status: characterized
+---
+
+# Alba Mons Lava Tube System
+
+**Location:** 40.47°N, 250.4°E (Arcadia quadrangle, Mars)
+**Status:** Morphologically characterized, not thermally characterized
+**Significance:** Strongest known Mars settlement co-location candidate for radiation shielding and water ISRU
+
+## Overview
+
+Alba Mons is a broad shield volcano hosting documented lava tube systems on its western flank, with ice-rich mantling deposits overlying the volcanic structure itself. At 40.47°N, it sits within the brine-active zone (>30°N) and adjacent to Arcadia Planitia's excess ice deposits.
+
+## Key Features
+
+**Lava Tubes:**
+- Large concentration of lava tube systems on western flank (Crown et al. 2022)
+- Morphologically characterized but not thermally characterized
+- Provide standard Mars lava tube radiation shielding: ~20x GCR dose reduction at 6.25m depth to ~12 mSv/year
+
+**Water Ice:**
+- Ice-rich mantling deposits directly overlie Alba Mons features (Crown et al. 2022)
+- Pedestal craters, infilled craters, heavily mantled lava flow margins on northern distal flanks
+- Within 2 degrees latitude of Amazonis Planitia shallow ice sites (AP-1, AP-8, AP-9)
+- Located in brine-active zone (>30°N) with seasonal near-surface melting
+
+## Co-location Advantage
+
+Alba Mons is the only Mars site currently characterized where:
+1. Lava tube radiation shielding is documented
+2. Ice-rich deposits exist on the same volcanic structure
+3. Location falls within the brine-active zone for liquid water access
+
+This makes it a stronger settlement co-location candidate than Elysium Mons (24-29°N, outside shallow ice zone) despite Elysium having a more thoroughly studied skylight.
+
+## Limitations
+
+- Lava tubes are morphologically characterized only (Crown 2022), not thermally characterized like Elysium Mons skylight
+- Northern latitude (40°N) means colder surface temperatures
+- Tube accessibility relative to ice deposits requires site-specific analysis
+- Lower altitude than other Tharsis volcanoes but gentler slopes
+
+## Timeline
+
+- **2022** — Crown et al. publish "Distribution and Morphology of Lava Tube Systems on the Western Flank of Alba Mons, Mars" in JGR:Planets, documenting large lava tube concentration and ice-rich mantling deposits
+- **2025** — Luzzi et al. document near-surface ice at Amazonis Planitia sites within 2 degrees latitude of Alba Mons
+- **2025** — Nature Communications marsquake study confirms brine-active zone >30°N, placing Alba Mons within seasonal liquid water access region
\ No newline at end of file
diff --git a/inbox/queue/2026-05-03-alba-mons-lava-tubes-ice-co-location-settlement-candidate.md b/inbox/archive/space-development/2026-05-03-alba-mons-lava-tubes-ice-co-location-settlement-candidate.md
similarity index 98%
rename from inbox/queue/2026-05-03-alba-mons-lava-tubes-ice-co-location-settlement-candidate.md
rename to inbox/archive/space-development/2026-05-03-alba-mons-lava-tubes-ice-co-location-settlement-candidate.md
index 404a3f27a..22dc68bd0 100644
--- a/inbox/queue/2026-05-03-alba-mons-lava-tubes-ice-co-location-settlement-candidate.md
+++ b/inbox/archive/space-development/2026-05-03-alba-mons-lava-tubes-ice-co-location-settlement-candidate.md
@@ -7,10 +7,13 @@ date: 2026-05-03
 domain: space-development
 secondary_domains: []
 format: article
-status: unprocessed
+status: processed
+processed_by: astra
+processed_date: 2026-05-03
 priority: high
 tags: [mars-settlement, alba-mons, lava-tubes, water-ice, isru, radiation-shielding, site-selection, arcadia-planitia]
 intake_tier: research-task
+extraction_model: "anthropic/claude-sonnet-4.5"
 ---
 
 ## Content