Imagine your vessel is delayed, not by weather or mechanical failure, but by a software glitch in the engine controls. The investigation eventually traces the root cause not to a sophisticated hack, but to a routine software update. This update was delivered months ago by a small third-party company that services the diagnostic tools for your engine manufacturer. You’ve never heard of them. But they’ve just impacted your multi-million-pound asset.

This isn’t a far-fetched scenario. It’s the new reality of supply chain risk. We in the maritime industry are masters of physical supply chains. But we are only just beginning to grasp that every critical piece of Operational Technology (OT) on our ships—from navigation systems to ballast water treatment plants—is itself a miniature, deeply complex digital supply chain.

The industry had its wake-up call with the NotPetya incident, which famously brought a global shipping giant to its knees. The attack didn’t target the company directly. It started with compromised accounting software from a third party, rippling outwards in a catastrophic chain reaction. It was a brutal lesson in what experts drily refer to as ‘Nth-party risk’—the risk that comes not from your supplier, but from your supplier’s supplier, or even their supplier’s supplier.

Herein lies the aha moment for many in our industry: we have been treating OT security and supply chain security as two separate problems, when in fact they are often the very same thing.

Think of your ship’s ECDIS. It’s made by Company A. But Company A uses software components from Company B. The developers at Company B, in turn, use an open-source code library from Project D. A single vulnerability in Project D, managed by a handful of volunteers, is now a direct threat to your vessel’s navigation. The port crane that loads your cargo? It’s maintained by a third-party contractor, who uses their own diagnostic software. The greatest threat to your OT isn’t always someone hacking the ship; it’s someone hacking the obscure company that provides a tiny piece of software to the technician who maintains the crane.

This is the industry’s blind spot. Traditional risk management, often involving sending questionnaires to your direct suppliers, is like trying to inspect an iceberg by only looking at the bit above the water. It’s a comforting illusion of due diligence. Regulators are catching on. The latest IMO guidelines and IACS requirements implicitly demand that shipowners understand and manage the risks posed by their entire ecosystem, not just their immediate contractors.

This presents a seemingly impossible task. How can a shipowner possibly map, monitor, and manage the cyber health of the hundreds of invisible suppliers buried deep within their operational technology supply chain? The answer lies in shifting from periodic checks to continuous visibility—treating digital supply chain health with the same seriousness as the physical integrity of your fleet.