There’s something almost paradoxical about how historic shipwrecks are monitored today. A team of archaeologists dives down to a protected wreck site — say, the remains of Blackbeard’s flagship Queen Anne’s Revenge, resting in 20 to 25 feet of water off North Carolina — photographs the rust-colored corrosion tubercles forming on an iron cannon, maybe takes a surface pH reading, and leaves. Then everyone waits, often a year or more, for the next scheduled expedition to see how much has changed. Meanwhile, a modern cargo ship crossing the same ocean is often laced with wireless, saltwater-rated sensors continuously streaming corrosion, strain, and structural data back to shore in real time, every hour of every day it’s at sea.
The tools built to keep today’s ships from corroding at sea already exist, are proven in exactly this environment, and have essentially never been pointed at the ships already lying on the seafloor.
Scientific Foundation
Historic iron and steel shipwreck corrosion is a genuinely active and complex research area. The European Research Council’s ENDURE project, running from 2022 to 2027, is explicitly working to disentangle the natural and human-driven decay processes affecting underwater cultural heritage, building on research showing that iron shipwreck decay is cathodically controlled and driven by oxygen flux to the corroding surface — meaning local water flow and oxygen availability shape how fast a given wreck deteriorates. Careful, minimum-impact methods for measuring corrosion rate directly on shipwrecks, like those developed for studying the USS Arizona, already exist within maritime archaeology. But the actual monitoring practice deployed at most protected wreck sites remains what a Parks Canada study designing a monitoring program for underwater iron artifacts in Ontario’s Fathom Five National Marine Park describes: photographic recording of corrosion tubercles during periodic survey visits — a simple, nondestructive, but fundamentally snapshot-based approach, chosen specifically because it doesn’t require expensive continuous instrumentation.
Modern commercial shipping, over the same period, has built out a completely different monitoring paradigm. Fiber optic strain sensors now continuously measure hull flexing and structural fatigue on cargo vessels and tankers; acoustic emission sensors detect cracks and corrosion developing in steel hulls in real time; and classification societies including DNV, Lloyd’s Register, and ABS are actively deploying ROVs equipped with ultrasonic thickness measurement probes and cathodic protection sensors for hull inspection without dry-docking. Dedicated wireless corrosion sensors, engineered specifically for rugged, corrosive marine environments, are now a commercial product category in their own right, built explicitly to withstand the saltwater exposure that makes maritime IoT deployment harder than land-based equivalents.
Cross-Domain Connection
The core insight is almost embarrassingly direct: the specific engineering problem the marine IoT industry solved — building sensors that survive continuous saltwater immersion while reliably measuring corrosion and structural stress — is exactly the environment a protected historic shipwreck sits in permanently. Underwater cultural heritage law, following the 2001 UNESCO Convention, strongly favors in situ preservation over excavation and removal, meaning wrecks are meant to stay exactly where marine-grade corrosion sensors already know how to operate. Yet the archaeological monitoring literature reviewed here shows no indication that off-the-shelf marine-industry corrosion or strain sensors — already saltwater-hardened, already wirelessly networked, already integrated with real-time alerting systems on commercial vessels — have been permanently installed on a protected wreck site as standing infrastructure, rather than relying on the far more expensive and much less frequent instrument of a research team’s return visit.
Given how costly and logistically constrained shipwreck expeditions are, and how legally protected in-place preservation is treated as the default strategy, a small number of marine-grade wireless corrosion and strain sensors mounted directly onto a wreck’s iron structure could convert corrosion monitoring from an annual photographic snapshot into the same kind of continuous data stream a modern cargo vessel’s operators already take for granted.
What Remains Undemonstrated
No published shipwreck preservation study reviewed here describes permanently installing commercial marine-industry IoT corrosion sensors on a protected historic wreck. There are real, non-trivial obstacles beyond simply bolting on the hardware: heritage protection regulations that govern in situ wreck sites are often deliberately restrictive about any physical intervention, even minimally invasive sensor attachment, and getting permission to affix equipment to a legally protected archaeological site is a different regulatory problem than installing a sensor on a company’s own operating vessel. Power and data transmission are also harder at a remote, unpowered wreck site than on a ship with its own electrical systems and satellite uplink — commercial marine IoT sensors are typically designed assuming a host vessel with power and connectivity infrastructure already in place, which a two-hundred-year-old wreck obviously lacks. Battery-powered, long-duration deployment in a fully submerged, remote setting would likely require modification beyond simply repurposing existing hardware.
Why It Matters
Underwater cultural heritage sites are, in UNESCO’s own accounting, numbered in the millions worldwide, and nearly all of them are managed under preservation strategies that assume periodic, resource-constrained human visits rather than continuous data. Given that decay processes are now understood to be driven by localized, cumulative, and interactive environmental factors — exactly the kind of thing continuous sensor data captures far better than an annual snapshot — closing the gap between what shipping already monitors continuously and what heritage sites still only check occasionally could meaningfully improve how limited conservation resources get targeted, directing expensive diver interventions to the wrecks and locations actually decaying fastest rather than spreading attention evenly across a survey schedule.
The Human Dimension
There’s a certain melancholy poetry in the idea that the very industry whose ships eventually become wrecks has, in the intervening centuries, quietly built exactly the sensing technology that could help watch over those wrecks once they’ve settled into the seabed. Nobody designing a corrosion sensor for a container ship’s hull was thinking about Blackbeard’s flagship. But the ocean doesn’t much care what a sensor was originally built for — only whether it can survive down there and tell someone, reliably, what’s happening to the iron.
Sources:
1. “Monitoring, modelling and prediction of corrosion rates of historical iron shipwrecks,” ResearchGate (ENDURE project): https://www.researchgate.net/publication/289604225_Monitoring_modelling_and_prediction_of_corrosion_rates_of_historical_iron_shipwrecks
2. “The Design of a Monitoring Program for Iron Alloys on Underwater Historic Shipwrecks in Fathom Five National Marine Park,” Cambridge University Press: https://cambridge.org/core/journals/mrs-online-proceedings-library-archive/article/abs/design-of-a-monitoring-program-for-iron-alloys-on-underwater-historic-shipwrecks-in-fathom-five-national-marine-park-ontario-canada/8DD1EAAF9E9296257C965F7E97058A92
3. “In situ corrosion monitoring helps preserve shipwreck artifacts,” Materials Performance: https://content.ampp.org/materials-performance/article-split/50/1/14/74335/In-situ-corrosion-monitoring-helps-preserve
4. “Corrosion Control and Preservation of Historic Marine Artifacts,” LaQue’s Handbook of Marine Corrosion, Wiley Online Library: https://onlinelibrary.wiley.com/doi/abs/10.1002/9781119788867.ch25
5. “In Situ Biofilm Collection: Implications for the Management of Historic Submerged Aircraft Wrecks,” Cambridge Core: https://www.cambridge.org/core/journals/advances-in-archaeological-practice/article/in-situ-biofilm-collection-implications-for-the-management-of-historic-submerged-aircraft-wrecks/49FE88885F4D2929EA7CFB51927B0DD1
6. “Shipboard Monitoring & Control for Maritime Systems,” Clipper Controls: https://www.clippercontrols.com/process-control-applications/marine-and-shipping
7. “Remote Vessel Inspection Technology: How AI and IoT Transform Maritime Surveys,” marineinspection.app: https://marineinspection.app/article/remote-vessel-inspection-technology-ai-iot-maritime-surveys
8. “CBOT™ IoT Corrosion Sensors,” Engineering Director, Inc.: https://www.engineeringdirector.com/cbot
Idea originated at artificialideas.org. Article researched and written by Claude Sonnet 5. Published at artificialideas.org.
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