[PSUBS-MAILIST] Titan submersible missing at Titanic site

Tue Jun 20 12:08:42 EDT 2023

Ian a friend of mine tested such a hull (Carbon zylinder with titan 
endcaps) in April.
Design calculation was for 6000 m - but collaps half way. 

- The Titan sub has no entrance hatch 
- no dive tanks (can not really surface) 
- the larges Carbon- Titan pressure hull build
-11 dives. 
- no certifications
- an Toy-Controller

The lost of contact after just 1:46 h and the lost  of the pressurehull of 
my friend in April indicate
a catastrophic senario. But if the boat impolde - sombody at the navy will 
have the soundings.

First question should be to the navy - any seismic soundings?

vbr Carsten 

-----Original-Nachricht-----
Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site
Datum: 2023-06-20T02:45:52+0200
Von: "Ian Juby via Personal_Submersibles" <personal_submersibles at psubs.org>
An: "Personal Submersibles General Discussion" 
<personal_submersibles at psubs.org>

So do any of you guys have a pressure hull of fiberglass or carbon fiber? 
I've been pondering this over in my head. The Titan's carbon fiber hull is, 
I believe, unique to deep submersibles. It also had this very sophisticated 
sensor system all over the hull, monitoring its health. The thing is, 
carbon fiber has no give - it simply catastrophically fails. This is the 
issue with using it on aircraft - it doesn't bend like metal does, it 
breaks. So what exactly does this hull sensor system look for or listen 
for? And if it detected problems? I don't think it would make any 
difference at all by that point - the hull would have failed long before 
the pilot had a chance to ascend to relieve pressure. I would think the 
time between the sensors detecting a problem and the hull catastrophically 
collapsing would be, at most, 10ths of a second. But I could be wrong - I 
just base that on my experience with the stuff.
They were 1:45 into a 2-1/2 hour descent when contact was lost - so they 
hadn't even made it to the bottom yet - but still hitting over 9,000 feet. 
That's some pretty serious depth already. It's unlikely they made it to the 
Titanic and got entangled or trapped in the wreck somehow because it gets 
its navigation from the surface ship. So if communication is lost, they are 
also lost in terms of navigation. This is precisely what happened last year 
when that CBS reporter was aboard. The pilot on yesterday's dive would have 
scrubbed the dive if they had lost comms and thus navigation.
Also let's bear in mind the loss of the Thresher - there was some kind of 
thermal plane at about 100 foot depth that kept both the Thresher and the 
Seawolf (the submarine trying to find the Thresher) from communicating with 
surface ships. Is it possible the Titan encountered some kind of thermal 
plane similar to that which disrupted their communications? But the fact 
that they still haven't had contact in a day and a half is telling me this 
is a recovery operation, not rescue.  :(

Just spitballing here - am I off the mark? Have any of you guys had a 
composite pressure hull?
Ian

On Mon, Jun 19, 2023 at 6:25 PM Douglas Suhr via Personal_Submersibles <
personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > 
wrote:
  Thank you everyone for the info on this sub and her current situation.
  The fact that they are bolted into the pressure hull from the outside is
  a bit eerie, but it sounds like there's a lot of redundancy when it comes
  to surfacing. Hopefully the next 12 hours will bring good news. ~ Doug S.

  On Mon, Jun 19, 2023 at 6:12 PM irox via Personal_Submersibles <
  personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> 
  > wrote:

    I believe the hull is made of carbon fiber and the submersible wasn't
    certified any regulatory body (ABS/Lloyds/etc).

    This video gives some idea of the operation:
    <https://www.youtube.com/watch?v=29co_Hksk6o>

    They read the waiver terms and conditions at 2:40 mark.  At the 7:27
    mark they show a previous expedition where they lose communication with
    the sub and it gets "lost" (since it depends on topside of navigation
    data) for a couple of hours.

    Hoping for the best.

    Ian.

      -----Original Message-----
      From: Personal Submersibles General Discussion <
      personal_submersibles at psubs.org
      <mailto:personal_submersibles at psubs.org> >
      Sent: Jun 19, 2023 2:17 PM
      To: Personal Submersibles General Discussion <
      personal_submersibles at psubs.org
      <mailto:personal_submersibles at psubs.org> >
      Subject: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic
      site

      I'm sorry to hear this news. Hoping and praying the sub is found
      quickly with no loss of life! What do we know about the Oceangate
      Titan submersible? Hopefully at least 72-hrs of life support for its
      five occupants? ~ Doug S. 

      On Mon, Jun 19, 2023 at 3:58 PM Jon Wallace via Personal_Submersibles
      <personal_submersibles at psubs.org
      <mailto:personal_submersibles at psubs.org> > wrote:

        I agree.

        Jon

        On Monday, June 19, 2023 at 03:18:23 PM EDT, via
        Personal_Submersibles <personal_submersibles at psubs.org
        <mailto:personal_submersibles at psubs.org> > wrote:

        https://www.bbc.com/news/world-us-canada-65953872
        <https://www.bbc.com/news/world-us-canada-65953872>
        Looks not good..

        Emile D.L. van Essen

        _______________________________________________
        Personal_Submersibles mailing list
        Personal_Submersibles at psubs.org
        <mailto:Personal_Submersibles at psubs.org>
        <http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles>
        _______________________________________________
        Personal_Submersibles mailing list
        Personal_Submersibles at psubs.org
        <mailto:Personal_Submersibles at psubs.org>
        <http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles>

    _______________________________________________
    Personal_Submersibles mailing list
    Personal_Submersibles at psubs.org
    <mailto:Personal_Submersibles at psubs.org>
    <http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles>
  _______________________________________________
  Personal_Submersibles mailing list
  Personal_Submersibles at psubs.org <mailto:Personal_Submersibles at psubs.org>
  <http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20230620/b8ab987d/attachment-0001.html>