2026 SOLAS Amendments: Mandatory Reporting of Container Losses at Sea
From 1 January 2026, important amendments to the International Convention for the Safety of Life at Sea (SOLAS) will introduce mandatory reporting obligations for the loss of freight containers at sea.
These changes, adopted by the IMO Maritime Safety Committee through Resolution MSC.550(108), amend SOLAS Chapter V (Safety of Navigation) and aim to address a growing safety and environmental concern: the increasing number of containers lost overboard from containerships and other cargo vessels.
The new provisions establish, for the first time under SOLAS, a clear international obligation for masters and operators to report container losses without delay, enabling maritime authorities and nearby vessels to take appropriate navigational safety measures.
The Growing Problem of Container Loss at Sea
Container shipping has expanded dramatically over the past decades, with modern ultra-large container vessels now carrying more than 20,000 TEU per voyage.
Although container losses represent a small percentage of total cargo transported, incidents involving large-scale container loss have raised serious concerns across the maritime industry. Severe weather events, cargo securing failures, parametric rolling, and vessel stability issues have occasionally resulted in hundreds, or even thousands, of containers being lost in a single incident.
Lost containers present several risks:
- Navigation hazards for passing vessels
- Environmental pollution, particularly when hazardous cargo is involved
- Financial loss and liability exposure for shipowners and cargo interests
- Search and recovery costs borne by coastal authorities
Until now, however, reporting practices were not fully harmonised internationally, and container losses were often reported inconsistently.
The IMO amendments seek to address this gap.
The New SOLAS Reporting Requirement
The amendments introduce a new requirement under SOLAS Chapter V Regulation 31, which deals with the reporting of dangers to navigation.
Under the new rule, the master of a ship involved in the loss of freight containers must report the incident without delay to nearby ships and to the nearest coastal State through the appropriate maritime communication channels.
The report must include information necessary to assist maritime authorities in identifying potential navigational hazards and responding to the incident.
In practical terms, the obligation applies whenever containers are lost overboard and the incident could pose a danger to navigation.
The reporting requirement applies broadly to all ships covered by SOLAS carrying freight containers, not only containerships.
Additional Reporting for Large Container Loss Incidents
The amendments also introduce enhanced reporting obligations where a significant number of containers are lost.
Where the number of containers lost exceeds a specified threshold, the ship must submit additional detailed information to the flag State administration and relevant authorities.
This information may include:
- The exact number of containers lost
- The location and time of the incident
- Whether the containers contain dangerous goods
- Any measures taken to mitigate risks to navigation or the environment
The purpose of these enhanced reporting obligations is to enable authorities to better coordinate navigation warnings, recovery efforts, and environmental protection measures.
Improving Maritime Safety and Environmental Protection
The IMO’s decision to introduce these amendments reflects a broader effort to improve transparency and safety in container shipping operations. Containers lost at sea can remain partially submerged and difficult to detect, posing a serious hazard to vessels navigating busy shipping routes. Smaller vessels, in particular, may face significant risk if they collide with floating containers.
Moreover, containers carrying hazardous or polluting cargo may create environmental risks, particularly when losses occur near coastal waters or environmentally sensitive areas.
By requiring prompt reporting, the new SOLAS provisions enable timely navigational warnings to other vessels, improved monitoring by coastal authorities and better coordination of search and recovery operations.
Operational Implications for Shipowners and Operators
Although the reporting requirement itself may appear straightforward, the amendments will have several operational implications for shipowners, managers and operators. Shipping companies may need to review and update:
- Safety Management System (SMS) procedures
Operational procedures under the ISM Code should include clear guidance on container loss reporting obligations. - Bridge team training
Masters and officers must be aware of the circumstances triggering mandatory reporting and the communication channels to be used. - Cargo securing practices and monitoring
While not directly addressed by the amendment, improved cargo securing and monitoring procedures will remain essential to minimise the risk of container loss incidents.
In addition, operators may need to coordinate with classification societies and flag administrations regarding reporting formats and procedural guidance.
The introduction of mandatory container loss reporting represents an important step toward greater transparency and accountability within the global container shipping industry. By establishing a clear obligation to report such incidents, the IMO ensures that container losses are no longer treated as isolated operational issues but as matters affecting navigational safety and environmental protection.
Given the continued growth of container shipping and the increasing size of vessels, regulatory measures of this kind are likely to play an increasingly important role in the global maritime safety framework. Shipowners and operators should therefore ensure that their operational procedures and compliance systems are updated ahead of the 1 January 2026 entry into force date.
How AGPLAW Can Assist
The new container loss reporting obligations form part of a broader set of SOLAS amendments entering into force on 1 January 2026, which introduce several important regulatory changes affecting shipowners and operators. These developments highlight the increasing regulatory focus on navigation safety, operational transparency and risk management in modern shipping.
Shipowners and managers should therefore review their operational procedures, reporting protocols and compliance frameworks in advance of the new rules coming into force.
At AGPLAW, our maritime team regularly advises shipowners, managers and maritime professionals on SOLAS compliance, flag State requirements and international regulatory developments. For a broader overview of the regulatory changes entering into force in 2026, readers may also wish to consult our analysis: “SOLAS Amendments Effective 1 January 2026, what Shipowners, Operators and Managers Must Prepare for Now.”
