TACKLING WSPR COST EFFICIENTLY AND HIGHLY EFFECTIVELY.

 

GROK:

The probable chance that heavy debris (e.g., engines, undercarriage/landing gear) from MH370 has been missed in Ocean Infinity’s “covered” high-priority zones is low—roughly 1–5% at most, and likely closer to 1–2% for large metallic objects in AUV-surveyed areas.
This is not zero because of the extreme depth (typically 1,100–6,000 m), highly complex seafloor terrain (steep slopes, canyons >300 m deep, ridges, chasms, seamounts, fracture zones like the Geelvinck Fracture Zone, and shadow-prone geology), and inherent limitations of even advanced sonar.
However, modern AUV technology (especially Ocean Infinity’s Hugin-class vehicles with synthetic aperture sonar/SAS and sidescan sonar/SSS) makes complete misses of prominent wreckage extremely unlikely in properly surveyed zones.
Why the chance is low overall

• Historical baseline from official reviews: In the original deep-tow searches (Fugro/ATSB era), ~97% effective sonar coverage was achieved. The remaining ~3% consisted of data “holidays” (gaps) and lower-probability-of-detection (LPD) areas due to terrain shadowing, vehicle avoidance on steep slopes, off-track issues, or rough geology that could obscure debris. Within the critical 40 NM radius around high-probability impact points, Geoscience Australia’s 2022 review of Phase 2 data quantified total holidays + LPD at only ~1.5% of the reviewed area (72.79 km² total, of which LPD was ~48.91 km²).
• Ocean Infinity’s AUV advantage: Unlike towed systems, AUVs (operating independently for up to 100 hours at depth, with multibeam sonar, sub-bottom profilers, magnetometers for buried metal, and laser/optical follow-up) navigate complex terrain far better. Ocean Infinity’s own operational summaries (e.g., for similar deep-sea searches) explicitly state “minimal data gaps and minimal LPD areas” with consistent high-quality SSS data. Their 2018, 2025, and 2025–2026 campaigns specifically targeted and “infilled” previous data holidays and steep-slope zones (including high-priority areas south of the Last Estimated Position that earlier searches skipped due to terrain). Multiple AUVs run overlapping lanes (e.g., effective swaths up to ~1.8 km wide at lower-resolution SSS mode), achieving near-100% practical coverage in the targeted boxes.

Why heavy debris is especially hard to miss (even in residual LPD/shadow zones)
Engines (~4 m diameter cores) and undercarriage/landing gear assemblies are large, dense, metallic objects that produce strong, multiple acoustic returns on even low-resolution SSS. They stand out dramatically against the flat abyssal plain or sediment. Experts (including WHOI and ATSB test data) note that such wreckage does not require high-resolution SAS mode—low-res SSS at ranges of 200–260 m per side is sufficient for detection in a debris field. LPD areas (where geology might mask smaller fragments) are far less likely to hide these items unless they are perfectly shadowed in a canyon or buried (magnetometers + sub-bottom profiling mitigate burial).
Remaining risks that justify a small non-zero percentage (~1–5%)

• Terrain-specific issues: Steep slopes, trenches, and cliffs can create acoustic shadows or force AUVs into safer paths, leaving narrow un-imaged strips or “bottom-of-slope” pockets. Independent analysts and search veterans have noted cases (e.g., ARA San Juan search) where one-pass scans missed targets in fracture zones. Ocean Infinity and experts (e.g., Richard Godfrey, Simon Maskell) openly acknowledge the “biggest challenge” is being “very close to the wreckage and missing it because of difficult terrain or gaps in the survey data.”
• Operational realities: Brief equipment malfunctions, weather interruptions (common in the Southern Ocean), or very localized geology can leave tiny residual gaps. Previous reviews documented small additional holidays (~1.57 km²) even after re-analysis.
• No official “100% guarantee”: ATSB/Geoscience Australia stated “little to no chance” of missing debris in fully searched areas, but this applies to well-mapped flat terrain. In the most complex zones, a conservative 1–5% residual miss probability for prominent heavy items aligns with the quantified LPD/shadow percentages and expert commentary on ongoing risk.

Ocean Infinity’s 2025–2026 campaigns (covering ~7,500+ km² across phases, including all priority data holidays and new extensions) were explicitly designed to close these gaps. No confirmed wreckage was found, which—combined with the technology—further reduces the chance that engines or undercarriage were overlooked in the surveyed zones. If the aircraft is in one of those “important” areas, the probability it was missed is very low; most analysts now lean toward it lying slightly outside the highest-probability boxes or in an unsearched pocket beyond current coverage.

In short, the terrain and depth do create real challenges, but AUV sonar performance on large metallic targets keeps the realistic miss probability in the low single digits for covered zones. Further expansion (if pursued) would target any remaining residuals.

With a dedicated swarm of magnetometer-equipped AUVs (e.g., multiple Hugin-class or equivalent vehicles flying coordinated, overlapping patterns with optimized mag-focused sensor configurations), the chance of missing heavy metallic debris targets like MH370’s engines or undercarriage/landing gear assemblies in “covered” high-priority zones drops dramatically—to roughly 0.1–1%, and most realistically around 0.5% or lower in practical deep-sea terrain.
This is a clear improvement over the 1–5% residual risk I estimated for standard multi-sensor AUV sonar campaigns.
Why the miss probability falls so low

• Magnetometer strengths for this exact target type: Large ferrous components in jet engines (steel cores, shafts, casings) and landing gear produce powerful, long-range magnetic anomalies—detectable even if the wreckage is partially buried under several metres of sediment or hidden in acoustic shadows from steep slopes, canyons, or overhangs. Ocean Infinity’s Hugin AUVs already carry self-compensating magnetometers (e.g., OFG SCM-type) precisely for this; real-world UXO/wreck tests show 100% reliable detection of seeded ferrous targets of comparable size when the AUV flies at typical survey altitudes (10–70 m). Unlike sidescan sonar (limited by terrain geometry and line-of-sight), magnetic fields propagate omnidirectionally through water and sediment with no “shadow zones.”
• Swarm geometry multiplies reliability: A true swarm (6–8+ AUVs running in parallel, as Ocean Infinity has demonstrated and plans to expand with coordinated USV support) enables:
  • Tighter lane spacing (e.g., 50–100 m instead of sonar’s wider 200–400 m effective swaths).
  • Multiple overlapping passes from different angles and altitudes.
  • Real-time adaptive re-tasking (one AUV detects an anomaly → others converge for confirmation). This eliminates virtually all data holidays and low-probability-of-detection strips that plagued earlier towed or single-pass surveys. Residual gaps shrink to tiny fractions of a percent.
• Quantitative baselines from similar ops: Marine magnetometer surveys for UXO or wrecks routinely achieve >98–99% probability of detection for large metallic objects once the area is fully gridded. Advanced post-processing (dipole inversion, particle-swarm optimization, anomaly matching) further reduces false negatives. In the MH370 context, the original AUV campaigns already assumed ≥95% overall detection probability; layering a mag-optimized swarm on top pushes the metallic-specific figure into the 99+% range for the surveyed boxes.

Why it’s still not literally zero (the ~0.5% residual)

• Extreme fracture-zone terrain (vertical cliffs, narrow chasms >300 m deep) can still create localized “dead zones” if an AUV cannot safely approach certain overhangs or pockets.
• Very deep burial (>5–10 m in soft sediment) or complete non-ferrous shielding (unlikely for engines) could theoretically attenuate the signal below noise thresholds.
• Rare operational factors: brief sensor calibration drift, geomagnetic storm interference, or equipment malfunction in a single vehicle (mitigated but not eliminated by swarm redundancy). These edge cases are exactly why conservative experts never claim 100% certainty, but they are now tiny compared with sonar-only limitations.

In practice, Ocean Infinity’s existing Hugin fleet already incorporates magnetometers alongside sonar, and their newer “coordinated swarm” architecture (with uncrewed surface vessels for persistent oversight) is designed to close exactly these residual risks. Deploying a purpose-optimized mag swarm in the remaining high-probability zones would therefore make an outright miss of prominent wreckage extraordinarily unlikely—far more so than visual/sonar methods alone.
Bottom line:
if the aircraft lies inside a properly surveyed box, a mag-AUV swarm gives you >99% confidence the heavy debris would have been flagged. The remaining uncertainty is almost entirely “is the plane actually in one of the boxes we’ve covered?” rather than “did we overlook it?” Further expansion of swarm coverage remains the highest-leverage next step.

The two modes of search we've discussed for MH370—standard multi-sensor AUV campaigns (primarily relying on high-resolution sidescan sonar/SAS, multibeam, sub-bottom profilers, etc., as Ocean Infinity has deployed in recent efforts) versus a dedicated swarm of magnetometer-equipped AUVs (optimized for magnetic anomaly detection of large ferrous targets like engines and landing gear, with tighter lanes, multiple angles, and adaptive re-tasking)—differ in cost primarily due to operational scale, sensor specialization, and efficiency.
Ocean Infinity's MH370 searches (2018, 2025–2026) have consistently used "no find, no fee" contracts, where the Malaysian government pays nothing if no wreckage is found, but up to $70 million if significant debris (e.g., main wreckage or flight recorders) is located. This structure applies regardless of the exact sensor mix, as the company absorbs upfront costs (vessel ops, fuel, crew, AUV maintenance) and only recovers via success fee.
Key Cost Comparison

• Standard mode (sonar-primary AUV search, as actually used):
  This is Ocean Infinity's baseline approach in the recent campaigns (e.g., 2025–2026 phases covering ~7,500–15,000 km² targeted, though partial due to weather). The potential payout remains capped at $70 million on success.
  • Their AUVs (Hugin-class) already include magnetometers as standard alongside sonar, so no major add-on hardware cost.
  • Efficiency: Wider swaths (hundreds of meters per pass), fewer vehicles needed for coverage, but higher residual miss risk for buried/shadowed metallic targets.
  • Implied cost to Ocean Infinity (borne by them if no find): Likely in the tens of millions per campaign (vessel time, multiple AUVs, data processing), but the client (Malaysia) risks only the $70M success fee.
• Optimized mag-swarm mode (dedicated heavy emphasis on magnetometers):
  This would involve more vehicles (e.g., 6–10+ AUVs in coordinated swarm), tighter survey lanes (e.g., 50–100 m spacing vs. 200–400 m for sonar), additional processing for magnetic data, and potentially minor config tweaks (enhanced mag sensors or calibration).
  • Cost difference estimate: 10–30% higher overall operational cost to Ocean Infinity compared to standard mode for the same area.
    • Reasons: More AUVs deployed simultaneously → higher power/fuel/logistics; more data volume and post-processing (magnetic anomaly inversion/matching); possible need for extra calibration flights or adaptive re-runs on anomalies.
    • Hardware: Each Hugin-class AUV is already valued at ~$8 million+ (with sensors included), so adding/swarming existing fleet doesn't require buying new vehicles—mostly operational scaling. No evidence of major extra hardware expense for mag focus.
    • Under "no find, no fee," the success payout would likely stay at $70 million (or negotiated slightly higher for increased confidence), but Ocean Infinity's risk/cost exposure rises due to greater upfront investment. They might push for a modestly higher cap (e.g., $80–100 million) if proposing this as a premium, higher-PoD option, but public contracts have stuck to $70M.
  • Net to client (Malaysia): Still $0 if no find, $70 million (or marginally more) if find. The real difference is Ocean Infinity bearing 10–30% more expense/risk to achieve the lower miss probability (~0.5% vs. 1–5%).

Bottom-Line Difference

• To the funding government (Malaysia): Minimal to none in practice under "no find, no fee"—both modes cost $0 unless wreckage is found, at which point it's ~$70 million either way (barring renegotiation for a specialized swarm). The mag-swarm doesn't meaningfully change the taxpayer exposure.
• To Ocean Infinity (operator): The mag-swarm mode is noticeably more expensive to run (roughly 10–30% higher per km² or per campaign), due to swarm coordination, denser coverage, and data intensity. This explains why they default to sonar-primary (balanced efficiency) unless a client specifically funds a mag-optimized push.
• Per-area rough benchmark: Deep-sea AUV searches like these run in the ballpark of several thousand USD per km² (factoring vessel/AUV daily rates), but exacts aren't public. For a 15,000 km² box, standard mode might cost OI ~$30–50M to execute (if unsuccessful); mag-swarm could push that to $40–65M—still covered only on success.

In short, the difference is mostly borne by the search company in risk and execution cost, not the payer.
A mag-swarm offers meaningfully better odds for heavy metallic debris at modest extra expense to OI, which is why it's attractive as an evolution of their existing fleet rather than a radically different (and far costlier) paradigm.
If pursued, it would likely fit within the same $70M success framework, making it a high-leverage upgrade without changing the headline economics.

For an independent company deploying a dedicated magnetometer-optimized AUV swarm to fully cover the WSPR block (Richard Godfrey’s proposed high-priority zone), the realistic full-upfront cost would be in the range of $25–45 million USD, with a total campaign duration of 3–6 months (including mobilization, transit, on-station operations, weather downtime, and demobilization).
This is dramatically cheaper and faster than the original multi-year, multi-hundred-million-dollar towed-sonar searches, but it is full-risk capital (no “no-find, no-fee” safety net like Ocean Infinity’s $70 M success-fee model).
WSPR Block Size (for planning purposes)
Godfrey’s core WSPR-derived crash location is repeatedly described as a circle of 30 km radius (≈ 2,827 km²) around the refined point near 29.128°S 99.934°E (depth 3,750–6,000 m in complex fracture-zone terrain).

The ATSB/Geoscience Australia formal review in 2022 used a conservative **40 NM (74 km) radius buffer** around an earlier proposed point (≈ 17,000 km² total requested), of which only ~4,900 km² had usable high-resolution data.

Practical independent survey: 4,000–6,000 km² (core + modest buffer + overlap for terrain shadows and 99 %+ PoD on heavy metallic targets). Larger buffers are unnecessary if the goal is simply to prove/disprove the exact WSPR hotspot.
Time Factor (realistic Southern Indian Ocean conditions)

• Survey rate with mag-optimized swarm (6–10 Hugin-class or equivalent AUVs, tighter 50–150 m line spacing, multiple-angle passes, adaptive re-tasking): 300–600 km² per operational day in good conditions. (Standard wide-swath sonar is faster; mag focus requires denser coverage for reliable anomaly detection and burial assessment.)
• Pure search time for ~5,000 km²: 8–18 days.
• Total on-station time: 5–12 weeks (factoring 40–60 % weather downtime typical of the Southern Ocean, infill runs on steep slopes/canyons, and real-time data QC).
• Full campaign timeline: 3–6 months end-to-end
  – Mobilization & vessel/AUV prep: 2–4 weeks
  – Transit (Perth/Fremantle or Cape Town round-trip): 10–20 days
  – Search + weather buffer: 5–12 weeks
  – Demob & final reporting: 2–3 weeks
  A single austral-summer window is feasible; a second season might be needed if weather is unusually bad.

Cost Breakdown (independent operator, full upfront)

• Mother-ship charter (Armada-class or equivalent AUV support vessel): $80k–$150k per day × 40–80 days at sea → $5–12 M
• AUV swarm operations (fuel, maintenance, mag-sensor calibration, multiple vehicles): $8–15 M
• Data processing, magnetometer anomaly inversion, QA/QC, and expert review: $4–8 M
• Mobilization/demobilization, crew, insurance, fuel, contingencies (complex terrain, equipment redundancy, potential re-runs): $8–10 M
• Total: $25–45 million (most probable $28–38 M range for a competent operator with existing fleet).

This is roughly 10–30 % higher per km² than a standard sonar-primary campaign because of the denser grid required for high-confidence magnetic detection of buried/shadowed engines and landing gear. Small-scale operations also lose some economies that Ocean Infinity achieves on 15,000+ km² jobs.
Key Caveats & Risk Adjustments

• Weather in the Southern Ocean is the single biggest variable — it can easily double on-station time and cost.
• Terrain (fracture zones, steep slopes) forces slower, more cautious AUV paths and extra infills.
• An independent operator would need either its own Hugin/equivalent fleet (or a service contract) plus proven deep-water mag-survey experience.
• No government “no-find, no-fee” backstop — this is pure private capital (investors, crowdfunding syndicate, or philanthropist). If the plane is found, salvage/recovery costs would be extra.

In short: a focused mag-swarm campaign on the WSPR block is entirely feasible for a well-funded independent team at ~$30 million and 4–5 months total elapsed time. It would deliver far higher probability of detection for heavy metallic debris than any previous sonar-only effort in the same zone — at a fraction of the historical search budgets.

The limiting factors are weather windows and having the right swarm-ready assets ready to deploy.