[PSUBS-MAILIST] Titan submersible missing at Titanic site

[Douglas Suhr via Personal_Submersibles]

So the mysterious disappearance of the Titan submersible is no longer a
mystery - she collapsed. But to me a vital question remains unanswered:
why, after so many different entities raised concerns over the use of the
carbon composite hull, did leadership forge ahead anyway? The fact that the
CEO was aboard would seem to indicate he was confident in his hull, but
why? Did he feel he knew better than all these other folks who raised
concerns? If it were one or two people who disagreed, that would be one
matter, but it would seem there's a list a mile long of those who raised
serious safety concerns (including 'amateur builders' like Karl Stanley).
Did any of the passengers on this voyage understand the highly
controversial decision to build with carbon fiber? The highly experienced
Frenchman who had logged so much time at Titanic was unconcerned? As
Carsten points out, wouldn't the guy have been suspicious that there was no
second submersible or at least ROV for mission redundancy?

Alan, I totally understand the practicality of using off-the-shelf parts
and components for non-critical applications, but as Alec suggests, it's a
matter of optics. After this episode, when the USCG asks to take a look at
one of our homebuilt submersibles and sees a game controller, what are they
going to think of? Among the many tasteless jokes being tossed around
online in the wake of this tragedy, one of the more G-rated ones went
something like this: The only time 'homemade' and 'submarine' should be
used in the same sentence is when you're making a sandwich in the kitchen!
This is a PR disaster for the homebuilt submersible community. ~ Doug S.

On Fri, Jun 23, 2023 at 8:57 AM Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I agree.  That's the bottom line.
>
> Jon
>
> On Friday, June 23, 2023 at 08:50:21 AM EDT, MerlinSub at t-online.de via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Ala
>
> - the question is not which controller your sub has.
>
> The question is how many paying Guest you have..
>
> vbr Carsten
>
>
>
>
>
>
>
> -----Original-Nachricht-----
>
> Betreff: Re: [PSUBS-MAILIST] Titan submersible missing at Titanic site
>
> Datum: 2023-06-23T08:39:07+0200
>
> Von: "Alan James via Personal_Submersibles" <
> personal_submersibles at psubs.org>
>
> An: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
>
>
>
>
>
>
> Hi Doug,
> my ambient sub had a game controller controlling speed, steering, ballast
> & a few other things. They have been tested and abused by several million
> kids. :) . But aside from that I had back up for all those functions so if
> it failed the sub still operated. And I am sure Oceangate would have done
> the same. ABS & DNV-GL have a principal that no one failure can cause a
> catastrophic event. Even though I have heard they weren't certified, they
> would certainly have been building to the rules.
> All a bit strange as they were only half way to the wreck.
> If the hull had have imploded it would have failed at maybe 1/4 of its
> crush depth. If power failed they would have gone to the surface, & should
> have had surface coms that would work with a back up battery.
> Alan
>
> Sent from Yahoo Mail on Android
> <https://mail.onelink.me/107872968?pid=nativeplacement&c=Global_Acquisition_YMktg_315_Internal_EmailSignature&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000604&af_sub5=EmailSignature__Static_>
>
> On Wed, 21 Jun 2023 at 12:41 am, Douglas Suhr via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
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