This unit describes the performance outcomes, skills and knowledge required to support self-contained underwater breathing apparatus (SCUBA) diving operations from the surface by acting as a ‘lazy shot operator’ and diver’s attendant in an open water environment.It includes confirming decompression requirements, preparing and rigging ‘lazy shot’ and attending to SCUBA diver/s from the surface. The lazy shot operator’s purpose is to mark the required decompression depth (through the use of the lazy shot) for ascending divers to service their decompression requirements. The diver’s attendant covers all aspects of assistance given to a diver in preparation for the dive, the conduct of the dive (such as managing and monitoring safety/communications lines) and the post-dive refurbishment of equipment.This unit was developed for Defence divers but may be applicable to anyone in this field.This unit relates, in part, to existing standards in the Australian Diver Accreditation Scheme (ADAS).The skills and knowledge described in this unit must be applied within the legislative, regulatory and policy environment in which they are carried out. Organisational policies, dive plan and procedures must be consulted and adhered to.Persons undertaking this unit work under supervision and perform specific tasks in a range of contexts that could be unpredictable.No licensing, legislative or certification requirements apply to this unit at the time of publication.