[PSUBS-MAILIST] Titan submersible missing at Titanic site

[Ian Juby via Personal_Submersibles]

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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