There are regions in the world that still depend on the use of vessels of opportunity from which to carry out surface supplied and saturation diving work. The vessels available in these regions exhibit varying degrees of 'fitness for purpose' and, therefore, on occasion it is necessary to properly brief clients as to what is and what is not a suitable platform from which to carry out the work. The range of vessels may vary from a derrick lay barge to a DP vessel, to a four point moored vessel. Each diving platform will have its own characteristics which need to be assessed to enable the diving work to be carried out safely and successfully.

Originally drafted by members active in IMCA's Asia-Pacific Section prior to review using the standard IMCA processes, this guidance aims to provide guidance to both clients and contractors when selecting a vessel of opportunity for diving operations. Generic guidance is given on assessing the suitability of such vessels, with an indication of factors to be considered, including both broad-based guidance and an overview of project-specific factors. The guidance provided is not designed to be exhaustive but is intended to cover the minimum requirements that should be satisfied.