Re: [PSUBS-MAILIST] escape question

[bruno masse <rodin4@videotron.ca>]

hi ray.

im talking about lakes dive,the deepest in quebec is about 350' feets
ok imagine all my electrical component in the sub are pressure isolate
and i have a tri-mix diving gear in the sub and begin to use the mix 10
or 15 minute before floading the sub,open the hach get out cut the net
 (i im already on the bottom) come back in the sub close the hach and
begin to pump out the waters with hp pump and come back to surface!
that way is it possible?
thank
----- Original Message -----
From: Ray Keefer <Ray.Keefer@Sun.COM>
To: <personal_submersibles@psubs.org>
Sent: Monday, October 13, 2003 12:58 PM
Subject: Re: [PSUBS-MAILIST] escape question


> Hi Bruno,
>
> Yes, it is possible.
>
> The problem I see is if the sub is stuck in a net at 300 feet. The bottom
could
> be 600 feet. As you flood the sub it could become heavier then the net
floats
> can support. By the time you flood out and egress the sub could be down to
> 400 feet or 500 feet.
>
> At some point you might was to consider getting out alive reward enough
and
> cut your losses by letting the hull go to the bottom.
>
> As others have mentioned you will need to breath mix gases to work at
> 300 feet for any length of time.
>
> As a design feature you could design your sub to be flooded. Either you
> have a diving lockout chamber or you flood the interior you are in.
> In either case your sub will have to be designed to:
>
> 1. Blow clear a flooded volume equal to what you want to flood. That is to
> keep your sub a neutral bouyancy.
>
> 2. Protect interior electrics and electronics from sea water. I doubt a
> typical fuse panel would take well to sea water. Your design will have to
> some how keep the two seperate.
>
> If you let your hull go and you decide to come back and get it,
> your sub it will be on the bottom with its hatch
> open. Some how you will have to get down to the sub, close the hatch,
attach
> an air hose, and blow your sub dry. The net you got stuck on will still be
> there. Possibly entangling your recue sub.
>
> In any case rescue of anything deeper scuba depth, say 160 feet. Starts
> to become problematic. What happens if the bottom is 3,000 feet?
>
> Some members here in PSUBS recommend never operating in water deeper then
> you can practically recover your sub in. Others recommend to never dive in
> water deeper then your crush depth. With your surface support ship calling
> for help and your 72 hours of life support you have three days to be
> rescued.
>
> Regards,
> Ray
>
> > bruno masse wrote:
> >
> > this is my question (maybe stupip!)
> >
> > ok imagine im stock in a fishing net at 300' feets and noting to do to
get out of this shit
> > is it posible to put my diving gears on ,fload the sub get out cut the
fishing net
> > come back in the sub pump the waters out and come back to surface with
out any problems?