Ships That Sail Themselves Are Now Real. The World Just Got Its First Law to Govern Them.

The IMO adopted the world's first international framework for autonomous commercial ships in May 2026 and it took effect on July 1. Here is what the MASS Code says, the enormous legal questions it still leaves open, and why India's 240,000 seafarers are watching it very closely.

A Ship With No One at the Wheel

In 2022, a Norwegian car ferry named Bastø Electric completed a fully autonomous crossing of the Oslofjord. No captain on the bridge. No crew giving orders. A remote operations centre on land monitored the transit, ready to intervene. In 2023, a Japanese cargo vessel completed a 240-nautical-mile fully autonomous voyage between Tokyo Bay and Ise Bay. By 2025, remotely operated container feeders were operating commercially in the Baltic Sea.

Autonomous shipping is not a concept anymore. It is happening. And until May 22, 2026, every ship doing it was sailing into a legal vacuum. There was no international regulatory framework governing what an autonomous commercial vessel was, who was responsible for it, how it should be certified, or what happened when something went wrong.

That changed when the International Maritime Organization adopted the International Code of Safety for Maritime Autonomous Surface Ships, known as the MASS Code, at the 111th session of the Maritime Safety Committee in London. The Code took effect on July 1, 2026, covering cargo ships on international routes.

What the MASS Code Actually Does

The MASS Code starts by doing something fundamental: defining what a Maritime Autonomous Surface Ship actually is, and establishing a framework for thinking about different levels of autonomy.

It recognises four degrees of autonomy in ascending order. At Degree One, the ship has automated processes and decision-support systems but a crew is still physically onboard making decisions. At Degree Two, the ship is remotely controlled from land with crew onboard who can take over if needed. At Degree Three, the ship is remotely controlled without any crew onboard at all. At Degree Four, the ship is fully autonomous, capable of making and executing its own operational decisions without any human input in the moment.

Each degree raises different safety, liability, and regulatory questions, and the Code provides a goal-based framework rather than prescriptive rules, meaning it sets safety outcomes that must be achieved rather than specifying exactly how to achieve them. This flexibility is deliberate: the technology is evolving too quickly for fixed prescriptive rules to remain relevant.

The substantive coverage is comprehensive. Navigation safety, remote operations infrastructure, cybersecurity, connectivity requirements, machinery systems, cargo handling, fire protection, watchkeeping standards when no crew is physically present, and search and rescue obligations all fall within the Code's scope.

The Most Important Principle: Humans Stay in the Loop

The most consequential provision of the MASS Code for anyone thinking about autonomous shipping liability is the insistence that a human master remains responsible for the ship at all times, regardless of the degree of autonomy deployed.

This is a deliberate and significant policy choice. The IMO could have said that at Degree Four, a fully autonomous ship, the software or the shipowner is responsible. Instead it said: there must always be a human master, and that master must retain the ability to intervene and override the autonomous systems when necessary.

In practical terms, this means that for remotely operated vessels without crew onboard, there is a remote operations centre somewhere on land where a designated master sits, monitors the vessel's systems, and holds the authority and responsibility of a traditional ship's master. The Code sets out requirements for what those remote operations centres must be capable of, including the connectivity and communication systems that make remote control and intervention technically possible.

The preservation of human responsibility serves two critical functions. It maintains the existing structure of maritime liability law, where the master and shipowner bear responsibility for the vessel's safe operation, without needing to create an entirely new liability framework for AI decision-making. And it provides a clear answer to the question courts and insurers have been most anxious about: when an autonomous ship causes an accident, who is responsible?

The answer under the MASS Code is: the human master who was responsible for that ship, and the shipowner. The fact that an automated system made the specific decision that led to the accident does not break the chain of human accountability.

The Legal Questions the Code Does Not Yet Fully Answer

Being the first international framework for autonomous ships is an achievement. It is also a guarantee of incompleteness. The MASS Code leaves several genuinely hard legal questions insufficiently resolved, and they will generate litigation before the mandatory version of the Code is finalised.

The most pressing is cybersecurity liability. A remotely controlled ship with no crew onboard and a land-based remote operations centre is a deeply attractive target for cyber attacks. The Code requires cybersecurity measures but does not specify what happens when an autonomous ship is successfully hacked and its actions cause loss or damage. If a cyberattack causes a fully autonomous vessel to collide with another ship, is the shipowner liable? The flag state? The software provider? The remote operations centre that failed to detect the intrusion? These questions are not answered by the Code and will require either legislative development or case-by-case judicial determination in each jurisdiction where such incidents occur.

The second gap is insurance. The Protection and Indemnity clubs that provide third-party liability insurance for the bulk of global shipping are still working through the implications of autonomous vessels. Existing P&I cover is designed around crew-operated vessels. Whether existing policies cover autonomous ship incidents, what new exclusions apply, and what evidence of seaworthiness autonomous vessels must provide to obtain and maintain cover are all questions that the market is still resolving. The MASS Code's entry into force gives the industry a framework to work against, but the insurance market will need years to develop appropriate products.

The third gap involves port state control. When an autonomous vessel arrives at a port, port state inspectors typically board the ship, inspect its systems, and verify compliance with applicable conventions. For a crewless autonomous vessel, this process needs to be reimagined entirely. The Code provides guidance but the practical implementation of port state control for autonomous vessels requires significant development at the level of individual port authorities and flag state administrations.

Non-Mandatory Now, Mandatory by 2032: What the Transition Means

The MASS Code currently operates on a voluntary basis. IMO member states are not required to apply it to their flagged vessels or enforce it in their ports. The Code is designed as an experience-building phase: the IMO wants to gather operational data from the autonomous vessel projects already underway before locking in mandatory requirements.

Mandatory Code development is expected to begin in 2028. Formal mandatory adoption is targeted for 2030. Entry into force of the mandatory Code is planned for January 1, 2032. This six-year runway from the voluntary Code's entry into force to mandatory enforcement is standard IMO practice for major new regulatory frameworks, reflecting the organisation's consensus-based process and the practical reality that flag states need time to transpose new international requirements into domestic law.

The voluntary phase creates its own commercial incentives for compliance. Shipowners and operators developing autonomous vessels want international regulatory legitimacy for their operations. Operating under the MASS Code, even voluntarily, provides that legitimacy and gives them a head start on compliance before mandatory requirements arrive. The experience-building phase also allows the IMO to identify gaps and problems in the Code through real-world operational data before those gaps are locked into mandatory binding rules.

Why India Cannot Afford to Watch This From the Sidelines

India supplies approximately 240,000 active seafarers to the global merchant fleet, making it the world's largest supplier of maritime labour. Indian seafarers serve on vessels operated by shipping companies headquartered in Greece, Norway, Japan, Germany, Singapore, and across the globe. Indian maritime training institutions supply qualified officers and crew that the international shipping industry depends on.

The transition to autonomous shipping does not eliminate seafarers overnight. Degree One and Degree Two autonomous vessels still require crew, albeit with different roles oriented toward monitoring and intervention rather than direct hands-on operation. Remote operations centres will require qualified maritime professionals who understand ships and navigation, making some seafarer skills valuable in land-based roles. But the long-term trajectory of the MASS Code toward fully autonomous vessels at Degree Four raises genuinely serious questions about seafarer employment at scale that the International Labour Organisation, the ITF, and India's Directorate General of Shipping have all begun to engage with.

For India's regulatory framework, the voluntary MASS Code creates an immediate practical challenge. The Merchant Shipping Act, 1958, and the regulations made under it, are built around crewed vessels with an onboard master. Whether and how these provisions apply to remotely operated or fully autonomous vessels operating in Indian territorial waters or calling at Indian ports requires urgent regulatory attention. India will need to decide what its position on the MASS Code is, how to apply it to vessels calling at Indian ports during the voluntary phase, and how to prepare its regulatory and training infrastructure for the mandatory framework that arrives in 2032.

The Bigger Picture: AI Meets Maritime Law

The MASS Code is the most consequential intersection of artificial intelligence and international law that any global regulatory body has yet produced at scale. The EU AI Act governs AI systems in European markets. The IMO's MASS Code governs AI systems operating on the world's oceans, which carry 90 percent of global trade.

The principle the IMO has chosen, that human responsibility must always be preserved regardless of the degree of automation deployed, will become enormously influential as other international bodies grapple with similar questions about AI liability in aviation, road transport, and infrastructure management. It is the international community's first clear statement that the advancement of autonomous technology does not diminish human legal accountability. Whatever the machine decides, a human is still responsible.

That principle will be tested in courts long before 2032. The first autonomous ship casualty that produces litigation will be a defining moment for maritime law and for AI law simultaneously. The MASS Code will be in the dock alongside whatever automated system made the decision that led to the accident.

This blog is for general informational purposes and does not constitute legal advice. For guidance on maritime law, autonomous vessel compliance, or international shipping regulation, please contact our team.