Overview
A safety investigation aims to understand how and why an event occurred so lessons can reduce recurrence. It is different from simply identifying the person closest to the final error. Good investigation follows evidence across people, equipment, procedures, supervision and organisational conditions.
For maritime professionals, the useful question is not only “what does the term mean?” but “what evidence would show that the work was performed properly?” This guide therefore focuses on the practical link between the governing framework, onboard or cargo-side activity, and the records a competent professional would expect to see.
Key Points to Understand
IMT conceptual illustration for learning purposes; not an official regulatory flowchart.
Practical Process
The exact method must always be adapted to the vessel, cargo, company procedures, local rules and the scope of the assignment. A disciplined sequence helps keep evidence complete and prevents the work from drifting away from its objective.
- Stabilise the situation and preserve evidence.
- Define investigation scope and team roles.
- Build a verified chronology.
- Collect documents, data, interviews and physical evidence.
- Analyse causal and contributing factors.
- Test findings against the evidence.
- Develop proportionate recommendations and issue the report.
Common Mistakes
Most weak inspections, surveys and audits do not fail because the professional forgot a complicated formula. They fail because scope, evidence or follow-up became unclear. Watch especially for:
- Starting with a preferred cause and collecting only confirming evidence.
- Equating human error with root cause.
- Writing recommendations that simply say 'be more careful'.
Practical Checklist
This is an IMT working checklist, not a substitute for the applicable convention, code, flag requirement, port rule, company procedure or contractual instruction.
- Evidence preservation
- Chronology
- Interviews
- Data/documents
- Causal analysis
- Human/system factors
- Recommendations
- Report review
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Incident Investigation
Build structured knowledge with IMT's online maritime training programme and apply the concepts in a disciplined professional workflow.
View the Training Programme →Frequently Asked Questions
What is a very serious marine casualty?
The IMO Casualty Investigation Code defines the term and requires a marine safety investigation into every casualty meeting that definition.
Is the purpose to assign blame?
Safety investigation is focused on understanding causes and preventing recurrence; legal or disciplinary processes are separate.
Why is chronology important?
It creates a common evidence-based sequence against which statements, alarms, records and decisions can be compared.
Authoritative Sources
Regulatory statements in this guide are grounded in the following primary or official sources. Operational recommendations are presented as IMT practical guidance.
International Maritime Training (IMT) is an independent training provider. This educational guide is not issued by, affiliated with, or endorsed by IMO, ILO, MPA Singapore, or any other authority referenced above.