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Trimix3

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Trimix3

  1. 1. DSAT Tec Trimix Diver Course Knowledge Development Presentation Three
  2. 2. Presentation Three Overview <ul><li>Emergency Procedures III </li></ul><ul><li>Techniques and Procedures III </li></ul><ul><li>Thinking Like a Trimix Diver III </li></ul><ul><li>Practical Application Three </li></ul>
  3. 3. Emergency Procedures III <ul><li>Missed Decompression Stops </li></ul><ul><li>Delay in Ascent </li></ul><ul><li>Omitted Decompression </li></ul><ul><li>DCS While Underwater </li></ul><ul><li>First Aid for DCI </li></ul><ul><li>CNS Symptoms Underwater </li></ul>
  4. 4. Missed Decompression Stops <ul><li>What are the procedures for missed decompression stops when diving with trimix? </li></ul><ul><ul><li>If you miss a decompression stop when diving with trimix immediately redescend </li></ul></ul><ul><ul><ul><li>Ideally in less than one minute </li></ul></ul></ul><ul><ul><ul><li>Complete the stop plus one minute </li></ul></ul></ul><ul><ul><ul><li>Decompress according to normal schedule </li></ul></ul></ul>
  5. 5. Missed Decompression Stops <ul><li>Procedures for missed decompression </li></ul><ul><ul><li>If you are unable to redescend stay at the next stop for a combined time of both stops </li></ul></ul><ul><ul><ul><li>Extend 6 metre/20 foot stop and final stop by 1.5 times normal deco time </li></ul></ul></ul>
  6. 6. Delay in Ascent <ul><li>What are the procedures for delays in ascents when diving with trimix? </li></ul><ul><ul><li>If you have a delay in ascent before reaching your first stop </li></ul></ul><ul><ul><ul><li>Add delay to bottom time and decompress on new schedule </li></ul></ul></ul><ul><ul><ul><li>Extend final stop as much as practical, gas allowing </li></ul></ul></ul>
  7. 7. Delay in Ascent <ul><li>Procedures for delays in ascents </li></ul><ul><ul><li>If you have a delay between stops </li></ul></ul><ul><ul><ul><li>It’s not critical if it’s not longer than 2-3 minutes </li></ul></ul></ul><ul><ul><ul><li>Do not count delay time in deco time </li></ul></ul></ul><ul><ul><ul><li>Extend final stop as much as practical, gas allowing </li></ul></ul></ul>
  8. 8. Omitted Decompression <ul><li>What are the procedures for omitted decompression when diving with trimix? </li></ul><ul><ul><li>From 6 metres/20 feet or shallower, have no DCS symptoms and return to stop depth in less than a minute </li></ul></ul><ul><ul><ul><li>Complete decompression as scheduled </li></ul></ul></ul><ul><ul><ul><li>Extend final stop time as much as practical, gas allowing continued… </li></ul></ul></ul>
  9. 9. Omitted Decompression <ul><li>Procedures for omitted decompression </li></ul><ul><ul><li>From 6 metres/20 feet or shallower, have no DCS symptoms and return to stop depth in more than one minute </li></ul></ul><ul><ul><ul><li>Extend 6 metre/20 foot deco stop and final stop by 1.5 times normal deco time </li></ul></ul></ul><ul><ul><ul><li>Extend final stop as much as practical beyond the 1.5 time deco time, gas allowing continued… </li></ul></ul></ul>
  10. 10. Omitted Decompression <ul><li>More procedures for omitted decompression </li></ul><ul><ul><li>From deeper than 6 metres/20 feet and have no DCS symptoms </li></ul></ul><ul><ul><ul><li>Return to stop depth as quickly as possible (less than 5 min. ideally) </li></ul></ul></ul><ul><ul><ul><li>Decompress according to schedule up to and including 12 metre/40 foot stop </li></ul></ul></ul><ul><ul><ul><li>Extend 9 m/30 ft stop and all shallower stops by 1.5 times normal deco time </li></ul></ul></ul><ul><ul><ul><li>Extend final stop beyond 1.5 times deco time as much as practical, gas allowing </li></ul></ul></ul>
  11. 11. Prevention <ul><li>Omitted decompression procedures are based on dive circumstances where there is no access to recompression chamber </li></ul><ul><ul><li>If a chamber is available it may be appropriate to follow chamber-based procedures </li></ul></ul><ul><li>Trimix is less forgiving than air/enriched air with respect to omitted decompression </li></ul><ul><ul><li>Emphasize prevention </li></ul></ul>
  12. 12. DCS While Underwater <ul><li>What should you do if you experience DCS symptoms underwater? </li></ul><ul><ul><li>It is rare to experience DCS symptoms before surfacing with air/EANx unless decompression has been skipped </li></ul></ul><ul><ul><li>Trimix is more likely to cause DCS </li></ul></ul><ul><ul><li>In trimix diving DCS symptoms, if it occurs, may happen at or above 6 metre/20 foot level </li></ul></ul>
  13. 13. DCS While Underwater <ul><li>If you experience DCS symptoms underwater </li></ul><ul><ul><li>Signal teammates and support divers </li></ul></ul><ul><ul><li>If possible complete your decompression </li></ul></ul><ul><ul><li>Extend stops 6 metres/20 feet and shallower on pure oxygen (with air breaks) </li></ul></ul><ul><ul><li>Stay on oxygen when you surface </li></ul></ul><ul><ul><li>Continue with first aid for DCS </li></ul></ul>
  14. 14. First Aid for DCI <ul><li>What is the recommended first aid for DCI when diving with trimix? </li></ul><ul><ul><li>First aid for DCI when diving with trimix is the same for any DCI incident </li></ul></ul><ul><ul><ul><li>Keep patient lying down </li></ul></ul></ul><ul><ul><ul><li>Monitor airway, breathing and circulation </li></ul></ul></ul><ul><ul><ul><li>Administer emergency oxygen, ideally 100 percent oxygen with a demand system </li></ul></ul></ul><ul><ul><ul><li>Responsive patients may drink water </li></ul></ul></ul><ul><ul><ul><li>Contact emergency medical care and the diver emergency service that services the area </li></ul></ul></ul>
  15. 15. CNS Symptoms Underwater <ul><li>What should you do if you experience CNS symptoms during a trimix dive? </li></ul><ul><ul><li>If you experience CNS symptoms underwater </li></ul></ul><ul><ul><ul><li>Immediately switch to low oxygen gas </li></ul></ul></ul><ul><ul><ul><li>Ascend as much as possible immediately without compromising decompression </li></ul></ul></ul><ul><ul><ul><li>Stay on low oxygen gas for at least 15 minutes after all symptoms subside </li></ul></ul></ul><ul><ul><ul><li>Keep your PO2 as low as possible </li></ul></ul></ul><ul><ul><ul><li>Convulsions are more likely to be fatal than DCS </li></ul></ul></ul><ul><ul><ul><li>Fullface mask reduces risk of drowning </li></ul></ul></ul>
  16. 16. Techniques and Procedures III <ul><li>Streamlining and Swimming Technique </li></ul><ul><li>Slow, Deep Controlled Breathing </li></ul><ul><li>Carbon Dioxide Buildup </li></ul>
  17. 17. Streamlining and Swimming Technique <ul><li>What level of streamlining and swimming technique is expected of a trimix diver? </li></ul><ul><ul><li>A trimix diver should have the highest levels of equipment streamlining and swimming technique </li></ul></ul><ul><ul><ul><li>Have all equipment necessary, don’t carry anything extra </li></ul></ul></ul><ul><ul><ul><li>Everything should be tucked, stowed and secured </li></ul></ul></ul><ul><ul><li>Swim with precision buoyancy control </li></ul></ul><ul><ul><ul><li>Remain neutrally buoyant </li></ul></ul></ul><ul><ul><ul><li>Fins high to avoid silting </li></ul></ul></ul><ul><ul><ul><li>Stay off the bottom </li></ul></ul></ul>
  18. 18. Slow, Deep Controlled Breathing <ul><li>Why does shallow breathing lead to rapid breathing and high gas consumption? </li></ul><ul><ul><li>Emphasize slow, deep controlled breathing </li></ul></ul><ul><ul><ul><li>Shallow breaths lead to poor gas exchange </li></ul></ul></ul><ul><ul><ul><li>Poor gas exchange causes carbon dioxide to build up and leads to breathing faster </li></ul></ul></ul><ul><ul><ul><li>Faster breathing only partly keeps up with the body’s demands </li></ul></ul></ul><ul><ul><li>Pay attention to breathing and keep it controlled at all times </li></ul></ul>
  19. 19. Carbon Dioxide Buildup <ul><li>In what two ways can carbon dioxide buildup affect you? </li></ul><ul><ul><li>Carbon dioxide buildup from shallow breathing has two effects to avoid </li></ul></ul><ul><ul><ul><li>Significant increase in gas consumption </li></ul></ul></ul><ul><ul><ul><li>Elevated narcosis </li></ul></ul></ul>
  20. 20. Thinking Like a Trimix Diver III <ul><li>Basics for Mission Planning </li></ul><ul><li>The Primary Mission </li></ul>
  21. 21. Basics for Mission Planning <ul><li>What four differences of diving with trimix versus air/EANx must you consider when planning a mission and how may each of these affect a mission plan? </li></ul><ul><ul><li>Decompression duration – typically longer </li></ul></ul><ul><ul><ul><li>Affects gas volume requirements </li></ul></ul></ul><ul><ul><ul><li>Exposure protection an issue </li></ul></ul></ul><ul><ul><ul><li>Need for support divers </li></ul></ul></ul>
  22. 22. Basics for Mission Planning <ul><li>Second difference </li></ul><ul><ul><li>Decompression duration – typically longer </li></ul></ul><ul><ul><ul><li>Affects bottom gas volume requirements </li></ul></ul></ul><ul><ul><ul><li>Bottom time may be too short to accomplish mission on a single dive continued… </li></ul></ul></ul>
  23. 23. Basics for Mission Planning <ul><li>Two more considerations affect mission planning </li></ul><ul><ul><li>Narcosis reduction – trimix less narcotic </li></ul></ul><ul><ul><ul><li>May allow divers to accomplish more </li></ul></ul></ul><ul><ul><ul><li>Time saved on complex mission may offset deco time </li></ul></ul></ul><ul><ul><li>Reduced breathing effort at depth </li></ul></ul><ul><ul><ul><li>Lighter helium may reduce breathing load </li></ul></ul></ul><ul><ul><ul><li>Necessary to account for higher breathing rate in volume planning </li></ul></ul></ul><ul><ul><ul><li>Trimix breathing gas is dense </li></ul></ul></ul>
  24. 24. Basics for Mission Planning <ul><li>What aspect of a trimix dive do you need to constantly remind yourself of? </li></ul><ul><ul><li>Because of reduced narcosis and breathing resistance, trimix dives often do not feel as deep </li></ul></ul><ul><ul><ul><li>Remember you are diving deep </li></ul></ul></ul><ul><ul><ul><li>You are using gas quickly </li></ul></ul></ul><ul><ul><ul><li>You are racking up deco time </li></ul></ul></ul>
  25. 25. The Primary Mission <ul><li>What is the primary mission of any dive? </li></ul><ul><ul><li>The primary mission of any dive is for the entire team to return from the dive unhurt </li></ul></ul><ul><ul><ul><li>Beware of too much mission focus </li></ul></ul></ul><ul><ul><ul><li>Be realistic in planning the mission </li></ul></ul></ul>
  26. 26. Practical Application Three - O bjectives <ul><li>Working as a team and using desktop deco software </li></ul><ul><ul><li>Plan two normoxic trimix dives, both with deep stops </li></ul></ul><ul><ul><ul><li>First dive requiring two decompression gases </li></ul></ul></ul><ul><ul><ul><li>Second dive with two or three decompression gases </li></ul></ul></ul><ul><ul><li>Plans to include gas consumption, oxygen exposure, decompression schedules, turn pressures and contingency decompression schedules for each team member </li></ul></ul><ul><li>Plan these two missions accounting for time required, specific tasks, individual team member duties and the effects on general dive planning </li></ul>
  27. 27. Presentation Three Review <ul><li>Emergency Procedures III </li></ul><ul><li>Techniques and Procedures III </li></ul><ul><li>Thinking Like a Trimix Diver III </li></ul><ul><li>Practical Application Three </li></ul>
  28. 28. Let’s Go Diving <ul><li>Training Dive Three - Objectives </li></ul><ul><li>Training Dive Four - Objectives </li></ul>
  29. 29. Training Dive Three - Objectives <ul><li>Working within a team </li></ul><ul><ul><li>Rig gear </li></ul></ul><ul><ul><li>A G ood D iver’s M ain O bjective I s T o L ive </li></ul></ul><ul><ul><li>B eing W ary R educes A ll F ailures </li></ul></ul><ul><li>Plan and execute a normoxic trimix accelerated decompression dive </li></ul><ul><li>Working as a team, attempt to complete the dive mission assigned </li></ul><ul><li>continued… </li></ul>
  30. 30. Training Dive Three - Objectives <ul><li>Correctly write down on a slate </li></ul><ul><ul><li>The decompression stops </li></ul></ul><ul><ul><li>Procedures to follow for an emergency missed decompression stop </li></ul></ul><ul><ul><li>Procedures for an omitted decompression or delay in ascent </li></ul></ul><ul><li>Respond correctly to simulated loss of decompression gas emergency </li></ul><ul><li>Demonstrate time, depth and gas supply awareness </li></ul>
  31. 31. Training Dive Four - Objectives <ul><li>Working within a team </li></ul><ul><ul><li>Rig gear </li></ul></ul><ul><ul><li>A G ood D iver’s M ain O bjective I s T o L ive </li></ul></ul><ul><ul><li>B eing W ary R educes A ll F ailures </li></ul></ul><ul><li>Plan and execute a normoxic trimix accelerated decompression dive </li></ul><ul><li>Working as a team, attempt to complete the dive mission assigned </li></ul><ul><li>Demonstrate time, depth and gas supply awareness </li></ul>
  32. 32. DSAT Tec Trimix Diver Course Knowledge Development Presentation Three End Show

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