SCP-4731 — SCP-4731 | Cost Breakdown

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SCP-4731 Safe ~ medium confidence

SCP-4731

Expected annual

$91.6M

One-time setup

$698.0M

Annual recurring

$63.8M

Personnel

Initial capital works dominate one-time costs (sealing, ISRU, power, habitat and contingency reserve) totaling hundreds of millions; recurring annual costs are driven by research/monitoring, MTF readiness, drone losses and logistics, producing a long-run expected annual spend in the low tens of millions to ~100M depending on operational posture.

🏗️ One-Time Capital Costs Total: $698.0M

Isru Capability $200.0M

[#12] Optional regolith processing plant for concrete, shielding and parts to reduce launch mass.

Contingency Reserve $200.0M

[#19] One-time reserve fund for accidents, emergency reseals, international incidents and rapid response (held as capital reserve).

Lunar Base Infrastructure $100.0M

[#13] Habitats, life support, medical/quarantine and radiation shelters if a permanent/nearby crewed presence is maintained.

Lunar Entrance Sealing $60.0M

[#1] Concrete/shotcrete caps, blast plates, anchors and robotic emplacement at multiple access points; includes transport or in-situ fabrication rigs.

Power Generation And Distribution $30.0M

[#3] RTG/battery or small reactor (Kilopower-class) selection, shielding and redundant distribution hardware.

Quarantine Facility $25.0M

[#20] BSL-4 / cosmic containment analog facility build for returned samples and personnel.

Decommissioning $25.0M

[#24] Cost for final re-closure or destruction of access tunnels (heavy engineering/sealing).

Deep Tunnel Reinforcement $20.0M

[#2] Reinforcement of the 20 km shafts and hardening of sensor ports against thermal cycling, micrometeoroids and EM/magnetic effects (installation costs).

Communications Hardware $10.0M

[#4] Space-rated high-gain antennas and Earth-side ground-station hardware; relay satellites treated as optional/extra.

Robotic Inspection Fleet $10.0M

[#7] Tethered rigs, mechanical winches, hardened probes and spare drones; development and procurement of magnetically-tolerant or mechanical alternatives.

Em R And D $5.0M

[#21] R&D for magnetically rugged sensors, fiber-optic tethers and mechanical systems to operate in extreme magnetic flux.

Redundancy Deployments $5.0M

[#22] Extra independent sensor chains and redundant deployments to prevent single-point data loss.

On Site Instrumentation $4.0M

[#5] Rugged optical, magnetometers, seismometers, spectrometers clusters with EM-hardened housings.

Telescope Upgrade $3.0M

[#6] Longhand 9-B modifications for remote, hardened, low-light long-exposure operation.

Data Handling Infra $1.0M

[#17] Secure archival systems and redundant on-Earth/off-site storage hardware.

🔄 Annual Recurring Costs Total: $63.8M/yr

Mtf Readiness $20.0M/yr

[#15] Annual readiness, training, specialized suits and small-scale response capability budget to respond to incidents.

Research And Monitoring $10.0M/yr

[#5, #6, #16, #23] Core scientific team funding, ongoing analyses, instrument calibration and baseline long-term automated monitoring contract (lower-end continuous monitoring assumed).

Logistics And Transport $10.0M/yr

[#10, #11] Baseline cargo/robotic launch cadence and occasional logistics launches; crewed rotations excluded from baseline (treated as scenario).

Staff Wages $5.0M/yr

[#9] Salaries, hazard pay, insurance and overhead for on-site rotations and Earth mission control staff (8–20 personnel range; baseline staffed-equivalent costs assumed).

Drone Replacement Budget $5.0M/yr

[#8] Budget for empirical drone/probe loss replacements (5–50 losses/yr risk profile; baseline replacement provisioning).

Isru Operations $5.0M/yr

[#12] Ongoing operations and maintenance if ISRU capability is built.

Quarantine Operations $2.0M/yr

[#20] Annual operations, staffing and maintenance for Earth-side quarantine/analysis facilities.

Cover Story And Legal $1.5M/yr

[#18] Ongoing cover operations, diplomatic liaison retainers and PR/legal costs to mask operations.

Containment Security $1.5M/yr

[#14] On-site and Earth-side security administration, background checks and cyber/physical access control recurring costs.

Facilities Maintenance $600K/yr

[#2] Monitoring upkeep and structural maintenance for deep shafts and hardened ports (monitoring hardening upkeep).

Supplies And Consumables $500K/yr

[#11] Routine consumables, spares and small resupply mass not covered under major launches.

Power Maintenance $500K/yr

[#3] Maintenance, replacement RTG units over decades, and upkeep for generation/distribution hardware.

Em R And D Ops $500K/yr

[#21] Continuing development and fielding of magnetically-hardened electronics and mechanical alternatives.

Robotic Maintenance $500K/yr

[#7] Ongoing ops and replacement spares for inspection and maintenance fleet (separate from replacement budget for lost autonomous drones).

Audit Oversight $500K/yr

[#25] Internal audit, oversight panels and periodic safety audits.

Redundancy Maintenance $300K/yr

[#22] Maintenance for redundant sensor chains and survivability systems.

Communications Ops $200K/yr

[#4] Bandwidth, ground-station operations and communications link maintenance.

Data Archival Ops $200K/yr

[#17] Hosting, secure archival operations and encrypted link maintenance.

Habitat Operations $0/yr

[#13] Habitat life-support operations (set to 0 in baseline robotic posture; cost appears if staffed presence is maintained).

⚡ Cost Scenarios

📊 Baseline (baseline) $63.8M/yr

80.0% probability / year

Low-profile, primarily robotic monitoring year with no crew rotations or major incidents.

automated_monitoring no_crew_rotations routine_maintenance

🚨 Minor Incident $73.8M/yr

12.0% probability / year +$10.0M vs baseline

Localized equipment/sensor failures and increased drone losses requiring short repairs and replacements.

sensor_failure localized_structural_damage elevated_drone_losses

🚨 Major Breach $763.8M/yr

2.0% probability / year +$700.0M vs baseline

Significant structural failure, large-scale contamination/exposure or TYCHO-like astronomical event requiring emergency reseal, MTF deployment and diplomatic damage control.

structural_collapse large_scale_emergence international_exposure

🚨 Staffed Operations $273.8M/yr

6.0% probability / year +$210.0M vs baseline

Year with active crew rotations and maintained lunar base operations (regular crewed launches and habitat operations).

crew_rotations continuous_habitation increased_launch_cadence

👥 Personnel 12 total

Role	Count	Notes
Research Scientist	4	[#9] Core scientific staff for data analysis and experiments (included in staff_wages).
Engineer / Maintenance	3	[#9] Systems, power, habitat and robotics engineers (included in staff_wages).
Technician	3	[#9] Instrumentation, deployment and operations technicians (included in staff_wages).
Medical Officer	1	[#9] Medical support for rotations and quarantine liaison (included in staff_wages).
Administrative Staff	1	[#9] Mission control, logistics and admin overhead (included in staff_wages).

📋 Confidence Notes

Analyst notes are detailed with explicit ranges for nearly every line item, enabling a constrained estimate; however large ranges (especially for launches, ISRU, reactor vs RTG choice, and contingency sizing) introduce substantial uncertainty in both one-time and recurring totals, so confidence is medium.

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