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47 metres down...

Discussion in 'General Scuba Diving' started by Matt Jordan, Nov 20, 2017.

  1. Matt Jordan

    Matt Jordan New Member

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    Has anyone seen this and not managed to have a nervous breakdown? I know diving can seem complicated to those not interested but it 'states' important diving facts to explain to non divers....which are so outrageously inaccurate you wonder why they bothered?!

    'Im sending down more tanks - the reason I didn't do this before was because breathing a second tank SIGNIFICANTLY increases your chances of narcosis'

    ........all whilst the main character is on 7 bar...then 5 bar...for over 20 minutes at 47m on a single 12, whilst panic breathing as a shark attacks.

    WHY?

    'the shark punctured my bcd....so my oxygen is escaping'

    HOW????? Just no words.

    'You need to stop at 20m to do a 5 minute decompression stop...now drop your bcd and swim for the surface as fast as you can'

    .... ....

    Sorry - I'm being forced to watch it as I write and needed to vent the stress and anxiety I am being subjected to due to this film being the biggest crock of monkey bollocks I have ever seen.

    I'm just glad I am part if this self help community
     
    Zubar and jps like this.
  2. speed098

    speed098 Member

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    I think the biggest issue with the film is who the **** did they get to give them professional advice on the diving.

    I would love to know to make sure I never dive even in a bath tub with them, after all with their in depth knowledge I might get bent if I duck my head under in the bath.

    Lets not mention the exposure protection, the industrial SPG, this is the only film I know that would beat Duracell for going on and on and on, there are that many things wrong with it.

    God forbid they do a sequal they might send down a spare air to last the night.
     
  3. Wibble

    Wibble Fish don't talk
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    James Bond managed to breathe from a couple of Sparklets Soda Siphon CO2 cartridges.

    Maybe they were chewing Oxygen Gum:)

    Don't let things like facts get in the way of a 'good' story
     
  4. Alex Denny

    Alex Denny Active Member

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    Just saw this movie. Hahahahaaaaaaaaa!

    To be fair, the bit where they swim to the surface, missing a single 5 minute deco stop earned for one hour at 47m on air is (apparently) a narcosis induced hallucination from someone who knows nothing about diving. So you could perhaps forgive it.

    The coastguard turning up, also in single 12s to 47m and no chain mail for the sharks is stupid though. And breathing from a cylinder with 1bar at a depth where ambient pressure is 5.7bar is novel. Oh, and changing cylinders underwater while flooding the first stage of a full face mask setup when you have no prior diving experience... Obviously!

    Stupid film.

    I rather enjoyed it!
     
  5. Vanny

    Vanny Active Member

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    I believe some or poss all of it was filmed in the underwater film studio at Basildon, essex. A full 6mtr deep pool!
     
  6. Wibble

    Wibble Fish don't talk
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    For a laugh...

    Aside from being off yer tits with narcosis, an hour at 47 metres on only air is 400 mins (6h40) with 4h30 at 6 metres and would need five 12 litre cylinders (12,200 litres) with no reserve.

    Depth Stop Run Mix pO2 EAD

    Des 47 - 2 21 - -
    Lvl 47 57 60 21 1.19 47
    Asc 24 - 62 21 - -
    Stp 24 1:27 64 21 0.71 24
    Stp 21 5:00 69 21 0.65 21
    Stp 18 7:00 76 21 0.59 18
    Stp 15 10 86 21 0.52 15
    Stp 12 17 103 21 0.46 12
    Stp 9 27 130 21 0.40 9
    Stp 6 268 398 21 0.34 6
    Sfc - - 400 21 - -


    CNS = 31%
    OTU's = 84
    Decozone start = 35 m
    Gas density = 6.8g/l
    Gas 21 = 12197 ltr.


    Doing it on Helitrox gas 23% oxygen, 20% helium with 50% deco gas would still need a bottom stage and have no reserve deco gas...

    Depth Stop Run Mix pO2 EAD

    Des 47 - 2 23/20 - -
    Lvl 47 57 60 23/20 1.30 31
    Asc 24 - 62 23/20 - -
    Stp 24 0:27 63 23/20 0.78 15
    Stp 21 4:00 67 50 1.54 10
    Stp 18 1:00 68 50 1.39 8
    Stp 15 5:00 73 50 1.24 6
    Stp 12 6:00 79 50 1.10 4
    Stp 9 11 90 50 0.95 2
    Stp 6 60 150 50 0.80 0
    Sfc - - 152 50 - -


    CNS = 60%
    OTU's = 162
    Decozone start = 34 m
    Gas density = 5.7g/l
    Gas 23/20 = 5221 ltr.
    Gas 50 = 1904 ltr
    .


    Or optimising with 23% oxygen / 30% helium would need a bottom stage and two deco gasses (50% and 80%), has reserves to cope with one failure, but get you out in just over two hours...

    Depth Stop Run Mix pO2 EAD

    Des 47 - 2 23/30 - -
    Lvl 47 57 60 23/30 1.30 24
    Asc 24 - 62 23/30 - -
    Stp 24 0:27 63 23/30 0.78 10
    Stp 21 4:00 67 50 1.54 10
    Stp 18 1:00 68 50 1.39 8
    Stp 15 4:00 72 50 1.24 6
    Stp 12 7:00 79 50 1.10 4
    Stp 9 11 90 80 1.51 0
    Stp 6 40 130 80 1.28 0
    Sfc - - 132 80 - -


    CNS = 75%
    OTU's = 191
    Decozone start = 34 m
    Gas density = 5.1g/l
    Gas 23/30 = 5221 ltr.
    Gas 50 = 481 ltr.
    Gas 80 = 1036 ltr.



    (All the above assuming SAC of 15 litres/min on the bottom and 12 litres/min at deco and using Buhlmann GF 50/80)
     
    jps likes this.
  7. Dave Whitlow

    Dave Whitlow Well-Known Member

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    @Wibble , you missed out the better way of diving to 47m :)
     
  8. Wibble

    Wibble Fish don't talk
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    :)

    Assuming 15/40... (is that right?). You're out in undertwo hours, but with a gas bill of ~£15 compared with ~£90 on OC

    Depth Stop Run Mix pO2 EAD

    Des 47 - 2 15/40 - -
    Lvl 47 47 50 15/40 1.30 20
    Asc 24 - 52 15/40 - -
    Stp 24 0:27 53 15/40 1.30 4
    Stp 21 1:00 54 15/40 1.30 2
    Stp 18 3:00 57 15/40 1.30 0
    Stp 15 4:00 61 15/40 1.30 0
    Stp 12 6:00 67 15/40 1.30 0
    Stp 9 9:00 76 15/40 1.30 0
    Stp 6 37 113 15/40 1.30 0
    Sfc - - 115 15/40 - -

    Dive # 1, ZHL-B+GF 50/80
    Elevation = 0 m
    CNS = 63%
    OTU's = 167
    Decozone start = 33 m
    Gas density = 4.8g/l
     
  9. Alex Denny

    Alex Denny Active Member

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    It used to be possible to dive there privately I think? Can you still?

    Ps. Is the “better way of diving to 47m” a bounce dive on air with no deco and back on board in 20 minutes for cheese and wine with Cousteau?
     
  10. JohnL

    JohnL Well-Known Member

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    Yes, weekday evenings through different dive clubs and, I think some time during the weekend during the winter. I've dived there three times and it is a proper dive with friendly Essex people.

    I had also heard that some of the filming of 47m down was made here. Brian, the boss of one of the clubs, tells the tale of being the plankton man, spreading it as necessary - it was shredded broccoli and after a few days the pool stank!
     
  11. Alex Denny

    Alex Denny Active Member

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    That's awesome. We might organise a club trip!
     
  12. Vanny

    Vanny Active Member

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    Yes it's available to clubs. We booked it out recently for a Sunday morning , well 90 mins pool time. Think we had about 12 divers in which is near practical maximum. Small cafe and air on site.
     
  13. Joe

    Joe Active Member

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    We use it every other Thursday in the water 8 till 9 £10 per person
     
  14. Alex Denny

    Alex Denny Active Member

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    Hi Joe. Sounds great! Do you take guests?
     
  15. Joe

    Joe Active Member

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    Hi Alex yes mate you just need to ring first to make sure there's no filming on £10 includes air and kit if needed. I will post dates and phone No in the new year

    Joe
     
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  16. Joe

    Joe Active Member

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    Ok next pool night is 25 Jan then every other Thursday.
    Address:
    The Underwater Studio (At the back by the cafe)
    Archers Fields
    Basildon
    Essex
    SS13 1DL
    Telephone: 07889 448295
    Landline: 01268 285011
    Email: contact@calypsobluediving.co.uk
    Ask for Brian
    We can also arrange Poseidon CCR try dives

    Joe
     
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  17. Alex Denny

    Alex Denny Active Member

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    Thanks! I’m away with work and can’t check the date properly yet but sounds brilliant. Will let you know ASAP!
     
    Joe likes this.

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