[PSUBS-MAILIST] Titan submersible missing at Titanic site

Tue Jun 20 16:18:01 EDT 2023

My hope is starting to dwindle. This article would seem to be rather
telling:

https://www.yahoo.com/lifestyle/whistleblower-raised-safety-concerns-oceangate-190058533.html

~ Doug S.

On Tue, Jun 20, 2023 at 12:16 PM MerlinSub at t-online.de via
Personal_Submersibles <personal_submersibles at psubs.org> wrote:

> 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> 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> 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>
>>> Sent: Jun 19, 2023 2:17 PM
>>> To: Personal Submersibles General Discussion <
>>> 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> wrote:
>>>
>>>>
>>>> I agree.
>>>>
>>>> Jon
>>>>
>>>>
>>>> On Monday, June 19, 2023 at 03:18:23 PM EDT, via Personal_Submersibles <
>>>> personal_submersibles at psubs.org> wrote:
>>>>
>>>>
>>>>
>>>> https://www.bbc.com/news/world-us-canada-65953872
>>>>
>>>> Looks not good..
>>>>
>>>>
>>>>
>>>> Emile D.L. van Essen
>>>>
>>>>
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>>>
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>>
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