15 The contents of these guidelines should be
brought to the attention of all shipboard personnel engaged in the
day-to-day operation of vessels to ensure they are fully understood.
This is particularly important where multi-lingual crews are employed.
16 The attention of all personnel engaged in maintenance
work on sewage systems should be drawn to the hazards of encountering
oxygen-depleted, toxic and flammable gases when entering sewage tanks
or working on the system. Appropriate safety procedures should be
observed before entering enclosed, hazardous or suspect spaces.