Proteksan-Turquoise YOGI superyacht sinking investigation

In this situation, it looks like the lens shattered a long time ago and nobody is picking up the pieces.

Yacht industry previous total loss

I tried to collect more informations about any previous total loss in the yachting industry
I heard about Land's End total loss In Corsica, a Britanny flag registred yacht
but i can't find any MAIB report.
Hope to find help here

Here's a link to an article in Le Monde (in French , for most of us here unfortunately) dating back to May 2012 that may lead to some possible explanation.
The reasons are not technical, and would give a field day to the conspiration theorists...
(Et le yacht de Stéphane Courbit sombra...)
In short, the owner (a french mogul involved in many different activities, from TV entertainment to power distribution and to on-line gambling...) got himself in sort of a complicated financial situation.
There is a line saying something to the extent "Insurances can cover debts" so maybe this could actually have been good news for him.
The article goes on by outlining his close relationship with the political powers, lending credibility to the fact that the enquiry may not have been entirely independant and objective.
We may continue to speculate on technical causes, but maybe it is not that complicated!
FWIW!

yacht accidents

A nice link to a long series of yacht accidents most of them with Red Ensign MCA flags

Yacht Accident Stories

I am looking to the MAIB reports to complete my university works without any success, do you where it is possible to find them ?

Some of these French moguls are questionable people (meaning questions surround them... you know the laws in France are strict about saying something negative about someone)... remember the owner of Couach, Fabrice Vial, was killed by a sniper 12 August 2011. Never heard anything what happened or what it was about. The Le Monde article basically indicates Stéphane Courbit the owner of Yogi was questionable too.

But I really don't think the who owned it has anything to do with the sinking other than whomsoever hired a questionable crew.

I do not get the progression. So, they got rid of their engines (by malfunction, frying'em, or whatever), okay, they still had master power up to the moment of bailing. Then they got some aft compartments partially flooded (beach clubs), meh, but ship is still holding upright (as Marmot correctly pointed out earlier), and there's a lot more watertight doors to go still.

By far not a flotsam yet. And the situation seems stable enough, even if not pleasant. There aint that much of a killer weather either - we can see that.

Then the crew just walks around for 7 hours donning life wests and trying to find ship logs until Jesus comes down from heavens and personally kicks the boat till it goes down? or what?

Maybe the compartment to get to the engne room to start the pumps was flooded and by opening the engine room door, it would then flood the engine room.....who knows....it seems like they were in-experienced and instead of focusing on working to save the ship, they focused on getting off of it.

The reason you can't seal back a watertight door is usually water pressure - does not correspond with slow-sinking-over-many-hours scenario. I can't for the love of me fathom inexperienced enough to leave open a door which you clearly see is a water ingress point.

Simply put, how do I sink a ship so slowly if, say, I try?

Hi,

This is why sliding doors are used in many well built vessels.

Well that's beyond the point; if the water ingress is powerful enough to prevent crew from sealing watertight doors surely sinking would take somewhat less then 7 hours?
if it's not, is it then within the realm of possibility for crew, no matter how bad, to just watch the leak for 7 hours without for once thinking "hmm, we should maybe try to seal watertight doors, possibly try to get some pumps working, and stuff like that"?

I just looked over some major sinkings, and it looks like Yogi is well set for a record: many a much bigger / more rugged ships sank way faster.

As befits a proper Logbook, it stood strong till the end and went down with the ship!

Maybe it was meant to sink, but just would not go down as fast as a crew member/s wanted.

What I was trying to say is, maybe and most likely the emergency bilge pump valving was located in the Engine room. The engine room was most likely dry as the generator stayed running. Maybe the compartment outside of the engine room door was flooded, keeping the engine room door pinned shut, and making it un-accessable for the crew to run the pumps.

Hi,

On a vessel like YOGI there should be a third bilge/fire pump located outside the main machinery space and powered from an alternate power source which is normally the emergency Genset.

This should mean that even if the engine room is completely flooded and main electrical power lost the emergency S/t Bd will be supplied by the alternate supply which needs to be above the weather deck.

The emergency S/t Bd will also supply other important consumers such as 1 fuel transfer pump , 1 steering gear system, 1 HP Air comp if Air Start used, lighting , Watertightdoors, sliding or power operated doors in escape routes, LSA launch power if required etc