| Description | A report on the use of manned submersibles utilised for a variety of observation tasks of the support vessel 'Protee' and the Perry PC 1203 submersible, the primary of three submersibles used. It discusses the techniques, records, personnel and equipment used to perform and record the work, a description of the inspections made, the main results and statistical analysis. There are three appendices, namely, sample reports and records, equipment specifications, and depth of cover summary sheets. Includes diagrams and charts where necessary. Some minor annotations and markings. |