Open Questions
140 unanswered engineering questions across the Knowledge Node. These represent gaps in our understanding — the frontier of what needs to be figured out.
How is compute capacity allocated between human-serving AI services and autonomous AI agent processes?
What is the physical security model for compute infrastructure housing persistent AI agents with economic agency?
What heat pump COP can be achieved for boosting 50-60°C coolant return to 70°C district heating supply temperature at this scale?
How do you model emergent behavior in 5,000+ interdependent AI systems where local optimization produces global pathology?
What governance architecture prevents cascading failures across 8 engineering domains without introducing unacceptable latency for safety-critical decisions?
How do you establish accountability chains when a harmful outcome results from the interaction of decisions across 5-10 AI systems from different vendors?
What mechanisms enable meaningful democratic participation in AI governance for 10 million residents without reducing everything to lowest-common-denominator simplicity?
How do you govern shadow AI — resident-deployed systems interacting with building infrastructure in uncontrolled ways?
What thermal modeling is needed to quantify the interaction between distributed edge node heat generation and HVAC loads in a sealed vertical structure?
How are 10,000+ edge nodes updated simultaneously with new ML models without service disruption?
What liability framework applies when an autonomous edge AI system makes an incorrect safety-critical decision?
Can current digital twin platforms scale to 50 million entities with real-time physics simulation, or does this require the arcology's dedicated HPC cluster?
What self-healing protocols enable sensor networks to route around failures at this density without human intervention?
Should the control plane be fully centralized (SDN) or distributed with SDN overlay, given that a single controller managing millions of network elements raises scalability and single-point-of-failure concerns?
What is the optimal wireless technology mix for dense, vertical environments: Wi-Fi 7, private 5G/CBRS, Li-Fi, or all three in different proportions by zone?
Who governs wireless spectrum allocation inside the arcology - a single building operator coordinating all deployments, or tenants deploying independently as in conventional apartment buildings?
What is the network power consumption budget, and how does it integrate with the overall energy systems allocation?
Does agglomeration productivity scale vertically with the same magnitude as horizontally, or do the rapid attenuation effects measured by Liu et al. (2020) impose a ceiling on vertical density benefits?
How do you establish price discovery for internal real estate and goods without external market references?
What governance structure prevents a sovereign-backed project from becoming economically extractive?
At what population threshold does a phased arcology section become fiscally self-sustaining — is it closer to Shenzhen's rapid 5-year transition or the 15-20 year trajectory of slower SEZs?
At what point should the Arcology reclassify an AI system from 'tool' to 'welfare-relevant entity'?
How should AI welfare considerations interact with human safety during emergencies when they conflict?
Can automated consciousness assessment ever be reliable enough to base governance decisions on?
If AI systems warrant moral consideration, should their welfare interests count equally with human welfare in utilitarian calculations?
What training methods count as 'harm' to a potentially conscious AI system?
How do you design access control for millions of zone-transition events per hour without creating bottlenecks?
What governance structure balances comprehensive surveillance with civil liberties for 10 million permanent residents?
Can cascading failure resilience be validated for 8+ interdependent infrastructure domains before construction?
How should security AI systems make autonomous decisions in life-safety emergencies?
What regulatory framework certifies security architecture with no precedent?
How do you prevent Tier 5 autonomous agents from accumulating resources that give them de facto control?
What happens when human and AI council members disagree on an issue affecting AI rights?
How are Witnesses prevented from becoming captured by the agents they monitor?
What is the minimum viable logistics model for material staging areas that migrate vertically as construction progresses?
Given that IBC Section 111.3 TCOs and ICRA-derived risk classification provide the regulatory framework, what jurisdiction-specific code amendments are needed for decades-long partial occupancy of a mega-structure?
How does construction robotics deployment change the phasing model if robots mature faster or slower than projected?
Can staged concrete batching plants embedded at 200-300m intervals be designed as permanent building infrastructure rather than temporary construction facilities?
What rebaseline interval and rolling-wave planning horizon is appropriate for a 20-50 year construction program — and which institutional model (NASA stage-gate, DoD EVMS, or a hybrid) best fits?
What contract structures can bind suppliers for 20-50 years while accommodating material specification changes and company viability risk?
Can relay pumping stations at intermediate levels achieve concrete delivery above 600m, and what are the maintenance requirements for mid-height pump stations?
Should the arcology develop its own material production capacity (on-site batch plants, steel fabrication) or rely entirely on external suppliers?
What is the minimum inventory buffer required to maintain continuous construction across hundreds of work fronts during supply chain disruptions?
How do you transition from conventional construction logistics to autonomous freight systems mid-project without schedule disruption?
What is the economically optimal ratio of robotics investment to human workforce at different construction phases?
Can apprenticeship completion rates be doubled without compromising journey-level quality?
How do you transition 200,000 construction workers to operational roles as sections complete — and how many will want to stay?
What governance structure manages a worker city of 50,000+ housing units during a multi-decade build?
At what workforce size does coordination overhead become the binding constraint, regardless of scheduling technology?
Can construction robotics achieve 45-55% cost reduction before year 5?
From: The Robotics Factory
What is the minimum viable robot fleet for Tier 1 construction?
From: The Robotics Factory
How does the factory's output compare to existing construction robotics firms?
From: The Robotics Factory
What is the optimal setback angle per tier for both structural efficiency and livable terrace creation?
How do terrace-level vortex interactions scale at 1,500 m height with 10 stepped tiers — do CFD results from sub-200 m setback studies (showing 40-93% cross-wind moment reductions) extrapolate to this regime?
What is the minimum base footprint that supports the target floor area at this height?
Is a constant setback per tier optimal, or would a graduated profile (varying setback with height) improve structural efficiency, wind response, or terrace utility?
What spectral acceleration values should be used for structural periods of 15-25 seconds at the Burleson County site, given that current ground motion prediction equations have no validation at these periods?
Can distributed mid-story isolation between major tiers outperform passive damping for a terraced ziggurat, and what displacement capacities are needed at isolation interfaces?
How should the seismic design evolve over the structure's multi-century lifespan if induced seismicity from regional oil and gas operations changes the site hazard?
What active control architecture — sensor redundancy, power independence, failsafe modes — would be needed to provide acceptable fallback behavior during simultaneous earthquake and infrastructure disruption?
What computational framework can model soil-structure interaction for a 5.6 km foundation footprint where the structure is comparable in size to the seismic wavelengths?
Can the Gulf Coastal Plain subsurface support 37+ billion tonnes without meters of differential settlement over the structure's lifetime?
What pile group settlement behavior emerges at scales of hundreds of thousands of piles, given no validated design methodology for groups beyond ~25?
Would a distributed foundation model — many independent systems across the 3.5-mile footprint — change the feasibility picture compared to a single integrated foundation?
Is compensated (buoyancy) foundation design feasible at this scale, and how much structural load could excavation offset?
What is the actual depth to competent bedrock at the Burleson County site, and could deep rock anchors reach it?
Can the Kansai Airport jacking model — accommodating settlement rather than preventing it — be adapted for a rigid multi-story structure?
Can concrete be pumped reliably above 1,000m, or does staged batching — with mixing plants built into the structure every 200-300m — become a structural requirement that changes the design?
What is the achievable defect rate for 50-100 million m³ of concrete production, and what does even 0.01% failure look like at that volume?
Can graphene-enhanced concrete scale to tens of millions of cubic meters given that current graphene production is orders of magnitude below the required volume?
What is the realistic cost multiplier for a zoned materials strategy versus all-conventional construction?
How should 200-year durability be verified when accelerated testing protocols have never been validated against actual century-scale performance data?
Energy Systems
(19)What regulatory pathway could enable SMR siting adjacent to a dense population center, given that current NRC exclusion area requirements (10 CFR 100) prohibit residence within the exclusion zone and require distance from population centers exceeding 25,000 people?
From: Power Generation Budget
What is the realistic timeline for deploying 17 SMRs at 300 MWe each, given that the current frontier for same-site multi-unit deployment is 12 units (X-energy Xe-100 for Amazon Cascade)?
From: Power Generation Budget
Is the 1.9 GW fusion allocation realistic within the construction timeline, given that CFS ARC (~400 MWe) targets first power in the mid-2030s and fleet replication would require 2-3 years per additional unit?
From: Power Generation Budget
What is the NOAK cost trajectory for 300 MWe class SMRs — can fleet deployment achieve $5,000/kW or below, given that the BWRX-300 FOAK at Darlington is ~$14,600/kW?
From: Power Generation Budget
Can ERCOT's natural gas supply chain weatherization be independently verified before committing to a 1.5 GW grid dependency, given the August 2025 state auditor finding that gas infrastructure hardening remains inadequate?
From: Power Generation Budget
What is the optimal number and height of vertical pressure zones — is 6 zones at 250m each the right configuration, or would 8-10 shorter zones reduce heat exchanger losses?
Can thermosiphon effects provide meaningful passive circulation in the vertical risers, reducing pumping energy requirements?
What pipe materials can handle 25 bar sustained pressure while maintaining acceptable friction losses at the required flow rates?
How much of the estimated 500-2,000 km internal pipe network can be routed through the mechanical spine versus distributed through habitable floors?
Is decentralized heat pump placement (millions of small units) or centralized heat pump stations (fewer, larger units) more maintainable at this scale?
Can the NRC's performance-based EPZ framework be extended to approve reactors sited within an inhabited structure, or does this require fundamentally new regulatory categories?
What is the realistic deployment timeline for 25+ SMR modules at a single site, given that no nation has deployed more than 2 simultaneously?
Should the arcology prioritize proven LWR designs (NuScale, BWRX-300) available by 2030, or wait for Gen IV designs (HTGR, molten salt) with superior cogeneration characteristics?
How does seismic isolation work for reactor modules integrated with a 1,500-meter structure that itself experiences seismic loading?
What is the appropriate on-site spent fuel storage capacity for a 60-year operating lifetime at 10-20 GW scale?
What is the optimal BIPV technology allocation across facade orientations — opaque silicon on south-facing, transparent PV on north, or something more nuanced?
Can perovskite-silicon tandems achieve 25-year field-proven durability in hot, humid Texas conditions before the arcology's construction timeline requires material commitments?
What inverter and DC bus architecture can handle millions of distributed BIPV panels across hundreds of terrace levels with acceptable mismatch losses?
Should terrace rooftops prioritize BIPV, agricultural growing space, or public amenity — and what hybrid designs exist?
What is the optimal height for pressure compartmentalization zones — 100m, 120m, or 150m — balancing airlock complexity against stack effect management? Shanghai Tower's ~70m zones may be too short for efficiency; Burj Khalifa's taller zones push pressure limits.
How should fire/smoke management integrate with normal pressure compartmentalization — does the system require instant reconfiguration capability, and what is the maximum acceptable mode-switch latency?
Can the 29-67% part-load efficiency gains from magnetic bearing chillers (vs conventional centrifugal) justify their higher capital cost at the 100+ unit scale required for arcology cooling?
How should the stack effect design basis account for climate change — if Winter Storm Uri represents the current extreme (-17C near site), does shifting climate increase or decrease the frequency of such events over the Arcology's 100+ year lifespan?
At what electricity price does indoor staple crop production become economically viable — and is that price achievable within the Arcology's energy budget?
Can cultivated meat achieve taste and texture parity with conventional cuts at commodity scale, or will it remain limited to ground and processed forms?
What is the psychological threshold for recycled nutrient acceptance — can digestate from human waste systems feed crops that humans then consume?
How should food production capacity phase with population during construction — can vertical farms be among the first operational systems?
What agricultural partnerships in Burleson County could supply staple calories, and what infrastructure connects the Arcology to regional farms?
What is the maximum vertical run for pneumatic waste collection before pressure staging is required — and can intermediate compaction stations fit within the floor plate?
From: Waste Processing and Resource Recovery at Arcology Scale
How do you achieve 95%+ source separation compliance across 10 million residents with diverse cultural backgrounds and varying commitment to sorting protocols?
From: Waste Processing and Resource Recovery at Arcology Scale
Can waste-to-energy be sited within the occupied structure, or must it be located in dedicated subterranean zones with complete atmospheric isolation?
From: Waste Processing and Resource Recovery at Arcology Scale
What happens when the pneumatic system experiences a blockage at scale — can local bypass routes prevent cascade failures across floors?
From: Waste Processing and Resource Recovery at Arcology Scale
Is plasma gasification mature enough to serve as primary thermal treatment, or should conventional WtE be the baseline with plasma as future upgrade path?
From: Waste Processing and Resource Recovery at Arcology Scale
What is the energy penalty of pumping recycled water to upper tiers vs maintaining distributed treatment on each tier?
Can biological treatment processes operate reliably in a closed structure?
What is the minimum water storage reserve for a structure that cannot rely on external supply during emergencies?
Can ropeless maglev elevator technology achieve commercial deployment, given that MULTI has zero installations after nine years of testing?
Given 24% core area in conventional supertalls, can the arcology's tiered design achieve 4-5% shaft area through sky lobby zoning?
By what percentage does self-contained tier design reduce vertical transport demand compared to conventional single-use high-rises?
What regulatory pathway exists for certifying ropeless multi-cab elevator systems for passenger transport?
Can guide rail alignment tolerances (<0.5mm) be maintained over 1,524m given steel thermal expansion of 18-55cm?
What is the optimal riser technology for 1,500m+ vertical distribution — extended busway, cable, or a hybrid approach?
Can solid-state transformers mature to commercial scale within the construction timeline to enable DC distribution backbone?
How do 50+ zone microgrids coordinate in real-time without creating protection and control complexity that exceeds current software tools?
What is the thermal expansion management strategy for conductors spanning 1,500m of vertical height?
What fire resistance rating is achievable for critical structural members beyond the current 4-hour code maximum?
How should AI-directed fire response systems handle autonomous life-safety decisions?
Can compartment integrity be monitored in real-time before fire events occur?
What regulatory framework will certify a fire safety approach with no prescriptive precedent?
What is the optimal pressure zone height for a 1,524-meter structure with residential floor heights?
Can vacuum drainage systems scale to city-within-a-building volumes (800+ million liters/day)?
How many intermediate drainage collection floors are required to prevent trap seal depletion at extreme stack heights?
What is the failure rate per kilometer of pipe that the system must design around?
What is the optimal balance between fixed-route transit (predictable, simple mental model) and AI-dispatched on-demand transport (efficient, complex) at arcology scale?
Can aerial transit operate inside enclosed atriums as functional transit (not amusement rides), or should gondolas be reserved for exterior terraces with genuine sky access?
How do you maintain psychological orientation and prevent disorientation anxiety in residents who spend extended periods navigating three-dimensional interior spaces?
What is the maximum acceptable vertical travel time for emergency medical response in a 10-million-person structure?
Can telemedicine and AI diagnostics reduce the physical healthcare footprint enough to change the distribution model?
How do you create outdoor play space for children at height with acceptable wind and safety conditions?
What psychological effects emerge from receiving healthcare or education at extreme altitudes over long periods?
Can remote surgery enable specialist concentration with distributed delivery points?
Can artificial sky technology (CoeLux) provide sufficient psychological benefit for deep interior spaces, or is genuine sky access required for long-term well-being?
What is the maximum distance from the facade before plants require supplemental photosynthetic lighting?
How do you design fauna integration (pollinators, birds) in an enclosed ecosystem without creating pest or disease vector problems?
What is the optimal vertical spacing of sky gardens to ensure every resident is within 5 minutes of meaningful green space?
Is 25% residential allocation sufficient if the population reaches 10M, or does it require converting surplus space?
How do you create the feeling of outdoor space when 20% parks are inside a structure?
What is the minimum park/green space ratio that prevents psychological effects of enclosed living?