2.2.1 Timing of the investigation
An investigation should be carried out as soon as possible after an occurrence. The quality of evidence, particularly that relying on the accuracy of human recollection, can deteriorate rapidly with time, and delayed investigations are usually not as conclusive as those performed promptly. A prompt investigation is also a good demonstration of commitment by all those concerned.
2.2.2 The occurrence site
Where possible, the site of the occurrence should be left unchanged until the investigation team has inspected it. Where this is not possible, for instance because of the need to make essential and immediate repairs following serious structural damage, the scene, should be documented by photographs, audio-visual recordings, sketches or any other relevant means available with the object of preserving vital evidence and possibly recreating the circumstances at a later date. Of particular importance is the recording of the position of individuals at the site, the condition and position of equipment, supervisory instructions, work permits and recording charts. Damage or failed components should be kept in a secure location to await the arrival of the investigation team, who may require detailed scientific examination of certain key objects. Such key objects should be carefully marked.
2.2.3 Witness information
Once the situation in the immediate aftermath of an occurrence has been stabilised and the threat to people, plant and the environment has been removed, everyone involved should commit their recollections to paper to assist in preserving their memory of events. In the event that local authorities take over responsibility for the investigation, the organisation/company involved should nominate a focal point to liaise with the authorities and to assist them in assembling the information they require. Where necessary, legal assistance should be provided.
2.2.4 Background information
Appropriate background information should be obtained before visiting the occurrence location. Such information might include, but is not necessarily limited to:
- procedures for the type of operation involved;
- records of instructions/briefings given on the particular job being investigated;
- location plans;
- command Structure and persons involved;
- messages, directions, etc., given from base/headquarters concerning the work;
- ship particulars and plans; and
- any other relevant information that may enable the investigator to understand the context of the incident.
