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Dive & Operational Planning

Dive & Operational Planning. Introduction. Dive planning is essential Extra needs in Extended Range diving Pre dive planning Group planning Dive planning Support divers Emergency planning. Pre Dive Planning. Dive depth & profile Gas mix & MOD for bottom & decompression gas

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Dive & Operational Planning

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  1. Dive & Operational Planning

  2. Introduction Dive planning is essential • Extra needs in Extended Range diving • Pre dive planning • Group planning • Dive planning • Support divers • Emergency planning

  3. Pre Dive Planning • Dive depth & profile • Gas mix & MOD for bottom & decompression gas • Decompression schedule (Also 5m deeper, 5 min longer) • CNS% & OTU • Gas requirements plus reserve • Equipment requirements • Risk assessment

  4. Pre Dive Planning • Risk Assessment • Identify hazards • Risk level • Consequences • Precautions • Balance

  5. Pre Dive Planning • Risk Assessment

  6. Dive Support Platform • Large amount equipment per diver • Spare gas • Decompression station • RIB/Hard boat option • Boat equipment • Recovery of divers • Emergency situation

  7. Decompression Station • Shot line • 2 x A3 or A4 buoys • polypropylene line 20 mm thick • 30kgs of weight • Decompression station • 2 x A3 or A4 buoys • Polypropylene line 20 mm thick • 2 x 2 metre length’s of shock cord (bungie) • 2 metre length of scaffold tube or similar

  8. Decompression Station • Attachment line • 12mm thick polypropylene line • 3m below the deepest stop • weighted with a 5kg sinker • pegboard

  9. 2 x A3 / A4 Buoys Deco' Stops 6 / 9m - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 24m - - - Pyle Stop Peg Board 5 Kgs 30Kgs 48m Decompression Station

  10. Dive Group Selection • Mentally & physically prepared • Dived up • Correct equipment • Compatibility • equipment • gas mix • gas consumption • Team work

  11. What - Ifs • Possible difficulties • Management • Frame of mind • Sheck Exley

  12. Sheck Exley’s What - Ifs • Before the Dive, What if…; • The gas company put the wrong gas in the cylinder you fill from? • The wrong grade of helium is in them? • There are impurities in the gas? • You miscalculate your mixtures and have too much oxygen? • Too little oxygen?

  13. Sheck Exley’s What - Ifs • On the Descent, What if…; • You do not have enough oxygen when you submerge? • Your depth gauge reads shallow? • A tank you thought had trimix was really nitrox, etc? • You overbreathe your regulator?

  14. Sheck Exley’s What - Ifs • During Decompression, What if…; • The decompression tables you have don’t work? • You lose your decompression tables? • You lose your watch? • You lose your depth gauge?

  15. More What - Ifs • Add our own • Buddy loses consciousness underwater? • Buddy has deco gas failure? • You surface and there is no boat • You lose your back-gas at depth? • Your dry-suit floods with mandatory decompression to do? • Your B.C.D. fails? • Your mask-strap breaks?

  16. Discussion Slide • Devise a problematic situation and discuss how to deal with it.

  17. Responsibilities • Extra tasks • Each person has responsibility • Decompression station • Drop cylinders • Gas checked

  18. Support Divers • Experienced divers - dived up • Able to set up equipment • Carry spare gas • Assist dive team • prior to dive • during decompression • during exit from water • Part of pre dive planning & dive plan

  19. Emergency Plan • Extra contingency to cover: • Loss of gas (on the slate) • Loss of shot-line • Dive team separation • Equipment failure • Change in dive profile – deeper and longer

  20. Summary • Extra details for dive plan • Pre dive plan • Support platform • Group selection • Gas availability • Emergency • Support divers • Whole dive plan

  21. Questions?

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