NURC/Navy Saturation Development Mission.
Principal Investigator: Craig Cooper, NURC/UNCW
The NOAA Undersea Research Center (NURC) at the University of North Carolina Wilmington is again working on a saturation project with the Navy’s Specialized Research Diving Detachment (SRDD) to conduct two Aquarius underwater laboratory saturation missions utilizing Underwater Breathing Apparatus (UBA), or rebreathers, for aquanaut excursions.
Rebreathers were used in early Navy habitat saturation diving in the 60’s, and from NOAA saturation habitats in the 70’s, but since that time, excursion diving has been done almost exclusively on open circuit scuba. There is a continuing interest by the NOAA Undersea Research Program (NURP) in the use of rebreathers from Aquarius, and the Navy, because of their extensive background in using rebreathers, is the logical choice to demonstrate the feasibility related to rebreather maintenance in a saturation environment, and their use on working dives. Four missions were conducted in 2006 using Navy MK16 rebreathers to conduct work from Aquarius.
It is the desire of NURC to further address the following issues:
- Maintenance of rebreathers by aquanauts during the mission, both planned pre- and post-dive servicing and checks, and unscheduled repairs;
- Increased bottom times between “fills” over open circuit scuba;
- the logistics of supplying consumables for rebreathers such as CO2 absorbent, O2, and diluent gases;
- installation of a cofferdam to do repair work on valving associated with a subsea flask farm
- installation of hydraulically driven embeddment anchors for seabed fastening of Aquarius deck construction
- core drilling and grouting of seabed fasteners for proposed telemetry tower near Aquarius
- and the possible use of the NURP developed REPEX tables, or modifications of the original tables developed for repetitive habitat excursions under NURP Technical Reports 88 — 1A & B.