Safe Port, War Risk and Force Majeure: The Evidence Behind Maritime Disputes

Whether a port was safe, or a call frustrated, often begins with its operational state: berth and terminal availability, closures or suspensions, damage, congestion, and whether cargo operations could actually be conducted. A port that is nominally open may be effectively unusable for a particular vessel or cargo.

The evidence is granular and time-specific. Terminal status can change day to day, and the relevant question is the condition of the facility at the moment the vessel was ordered there or arrived — not its general reputation before or after.

Access matters as much as the berth. Navigational restrictions, closed or contested approaches, suspended traffic-separation schemes and the availability of a safe route to and from the port all bear on whether the call could be made without exposing the vessel to danger.

Where the only available route ran through a contested area, the safety of the port and the safety of the approach cannot be separated. The evidence has to address the whole voyage to the berth, not the berth alone.

The security dimension turns on the threat geography around the port and its approaches: the history of attacks or interference, the reach of the credible threat, and how the specific area sat within it. Proximity to targeted infrastructure — terminals, anchorages, chokepoints — can expose a vessel independently of any targeting of the ship itself.

As with any war-risk assessment, the general reputation of a region is not the same as the exposure of a particular call. The analysis has to locate the specific port and route within the threat picture, at the relevant date.

Contemporaneous official material carries particular evidential weight: government and flag-state advisories, notices to mariners, and guidance from recognised maritime-security reporting bodies. Observable military or naval activity in the area at the time is a further, independent indicator of how the environment was understood.

These sources are valuable precisely because they are contemporaneous and external. They record how the risk was assessed at the time, rather than how it looks in retrospect.

The behaviour of the wider fleet is evidence in its own right. AIS-derived traffic — whether vessels continued to call, avoided the area, or changed routeing — shows how the market actually responded, and suppressed or diverted traffic can corroborate a genuinely elevated environment.

Insurance pricing points the same way. The treatment of an area by war-risk underwriters, the level of additional premium and the terms on which cover was written are a market signal about perceived danger at the time. None of these is decisive on its own; together they build a picture that a tribunal can weigh. How that picture is reasoned to a particular vessel is the subject of real danger in a maritime war risk dispute.