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Altitude diving Decompression closed-circuit oxygen ...... 18-18 omitted ...... 17-35 Ascent rate Decompression sickness closed-circuit oxygen diving ...... 18-27 in the water ...... 17-41 MK 16 ...... 17-21 Decompression tables Closed-Circuit Mixed-Gas UBA % Decompression Table Using 0.7 Constant Partial Pressure Breathing bag Oxygen in Helium ...... 17-21 closed-circuit UBA ...... 17-3 Closed-Circuit Mixed-Gas UBA Breathing gas Decompression Table Using requirements 0.7 Constant Partial Pressure emergency breathing supply ...... 17-29 Oxygen in Nitrogen ...... 17-21 Depth & single-depth limits definition ...... 18-16 Depth limits MK 16 ...... 17-1 Canister duration MK 25 ...... 18-16 MK 16 ...... 17-12 Descent rate MK 25 ...... 18-11 closed-circuit mixed-gas diving ...... 17-19 Carbon dioxide Dive briefing removal ...... 17-2 closed-circuit oxygen diving ...... 18-23 scrubber ...... 17-3 Dive Record Sheet ...... 17-17 toxicity ...... 17-39 18-6 , Diver training and qualification Carbon dioxide scrubber closed-circuit mixed-gas diving ...... 17-8 functions ...... 17-6 closed-circuit oxygen diving ...... 18-20 Caustic cocktail ...... 17-40 18-8 , Diving Supervisor Checklists closed-circuit mixed-gas diving brief ...... 17-17 Dive Record Sheet ...... 17-17 closed-circuit oxygen diving brief ...... 18-23 Chemical injury ...... 17-40, 18-7 closed-circuit oxygen diving check ...... 18-23 causes of ...... 17-40, 18-7 managing ...... 17-40, 18-8 symptoms of ...... 17-40, 18-7 ( Closed-circuit oxygen diving combat operations ...... 18-18 Emergency breathing supply medical aspects ...... 18-1 deployment procedures ...... 17-35 personnel requirements ...... 18-20 gas supply requirements ...... 17-29 CNS oxygen toxicity Emergency breathing system causes of ...... 18-3 MK 16 ...... 17-29 preventing ...... 17-37 Equipment symptoms of ...... 17-38, 18-2 required for closed-circuit mixed-gas treating dives ...... 17-13 convulsions ...... 17-38 required for closed-circuit oxygen dives . . . . 18-21 nonconvulsive symptoms ...... 17-38 Excursion treating nonconvulsive symptoms ...... 18-4 transit with excursion limits definition ...... 18-14 Combat swimming Excursion time closed-circuit oxygen ...... 18-18 transit with excursion limits definition ...... 18-14 operating limitations ...... 18-19 Explosive ordnance disposal Convulsions ...... 18-3 employing single, untended diver ...... 17-15 treating underwater ...... 18-4 safety procedures ...... 17-16

Index–Volume 4 Index 4-1 ) Postdive procedures closed-circuit mixed-gas diving ...... 17-21 Flying after diving closed-circuit oxygen diving ...... 18-27 closed-circuit oxygen dives ...... 18-18 Predive procedures Formulas closed-circuit oxygen diving ...... 18-22 calculating available EBS volume ...... 17-30 equipment preparation ...... 18-23 MK 16 gas endurance ...... 17-11 Pulmonary oxygen toxicity ...... 18-2 Purge procedure ...... 18-24 + errors ...... 18-25

Hand signals 5 closed-circuit oxygen ...... 18-20 Hypercapnia ...... 17-39, 18-6 Recirculation system preventing ...... 18-7 description ...... 17-2 symptoms of ...... 17-40, 18-6 maintenance ...... 17-3 treating ...... 17-40, 18-6 Recompression chamber Hypoxia ...... 17-39, 18-4 closed-circuit mixed-gas diving ...... 17-15 causes of ...... 17-39 symptoms of ...... 17-39, 18-5 6 treating ...... 17-39, 18-6 treating divers requiring decompression . . . 17-39 Single marked diving ...... 17-16 Single-depth limits ...... 18-13 0 Standby diver closed-circuit mixed-gas dives ...... 17-14 Middle ear Successive oxygen dives oxygen absorption syndrome ...... 18-8 definition ...... 18-17 symptoms ...... 18-8 exposure limits ...... 18-16 treating ...... 18-9 MK 16 7 emergency breathing system ...... 17-29 MK 25 Tended diving ...... 17-17 maximizin operational range ...... 18-19 Tinnitus ...... 17-38, 18-2 operational duration ...... 18-11 Transit purge procedure ...... 18-24 transit with excursion limits definition ...... 18-14 Transit with excursion limits ...... 18-13 2 definitions ...... 18-14 inadvertent excursions ...... 18-15 Off-oxygen interval rules ...... 18-15 definition ...... 18-16 Omitted decompression ...... 17-35 8 Operational hazards chemical injury ...... 17-40, 18-7 Underwater procedures Oxygen closed-circuit mixed-gas diving ...... 17-19 deficiency ...... 17-39, 18-4 closed-circuit oxygen diving ...... 18-26 MK 16 flask endurance ...... 17-9 Oxygen exposure limits 9 following mixed-gas or air dives ...... 18-18 single-depth ...... 18-13 VENTIDC ...... 17-38, 18-2 successive oxygen dives ...... 18-16 transit with excursion ...... 18-13 Oxygen supply : MK 25 ...... 18-11 Oxygen time Worksheets single-depth limits definition ...... 18-16 Dive Record Sheet ...... 17-17 transit with excursion limits definition ...... 18-15 Dive Worksheet for Repetitive 0.7 ata Constant Partial Pressure Oxygen 3 in Nitrogen Dives ...... 17-23

Paired marked diving ...... 17-16

Index 4-2 U.S. Navy Diving Manual—Volume 4