Trimix 108 meters dive 

George the Macaw & Skye Parrot Artist Thanks a lot !🙏

Christophe Ngo Van Duc You are very welcome! I don’t really know anything, I’m only an OW diver, but this is very inspiring. One day I’ll get myself to tech diver. 😊😊😊

You mean the low helium content or why do you say it?

​@@ericcartman9594Yeah. 38% He has an END of around 63m (assuming oxygen has equal narcotic effect, so END is really a little lower). I'd be narced out of my mind at that point still. Ideal mixture would be closer to 66% He to get the END closer to 30m.

Is that an integrated function with the rebreather or separate software to record and overlay on video? Thanks! - Found in the description (duh).

he only looks at his computer during the dive

so true. were my first thoughts. also nothing really inserting there, which is different at 60 - 70 Meter. No real need to go 108 m. All these could be me^^ . Just pressure on the head. This is what its all about- ^^

Yes i was about to write a comment about that .. his knees are way down ..using his hands alot .. alot of unnecessary movements ...

no light, gopro3 using the standard housing (the one that can go to 60m)

Hi, see the description of the video, there is a link to a blogpost that explains how to do it

I do not remember to have to brighten it up actually. It was apparently still sufficient light for the gopro. I was at 91m 3 weeks ago on the same spot and it was still pretty bright. Thanks!

@@christophengovanduc2729 what kind of case did you use for the GoPro to dive so deep? did you use any kind of filter or configuration in the camera?

@@humbertocamisotti9127 This I'd like to know as well, considering the standard GoPro diving case is only supposed to go to a max of 60 meters.

@@pieterveenders9793 Christophe mentioned 5 years ago that he had been using a standard gopro case. It seems it can go much deeper than 60 m :)

check the infos in the description, let me know if you have any problem

definitely has his knees down More like a fetal position Not really efficient

" Dive in La Caleta Dominican Republic " ?? not that hard to spot

Thanks Martin, if I remember correctly the gopro was just head mounted ( as I needed my hands to handle all those cylinders...)

Do you remember it's position? Are you using a mask with gopro mount or a custom joint? Mine is with custom joint, attached to my strap on the left side of my mask. And it always face the bubbles.

@@martingradev you can buy a mount for your mask the its at your forehead instead

Hi, you can find all the information here: portugnole.blogspot.com.br/2016/03/how-to-integrate-shearwater-information.html

Awesome. Thanks for posting that.

can you explain ? (i don't know anything about diving)

@@dvorak2676 I'd be happy to. I'll start with the very basic things and then move into the more overlooked things. Let's start with gas mixes. For both travel and back gas he has an END ( equivalent narcotic depth) above 40m. That's ridiculously high. Some agencies require that the gas END is not over 30m. It has to do with how dense the gas is, ie how much effort you have to put into breathing it at depth and how much nitrogen narcosis you have, it's like being drunk, a very bad idea at 100+ meters. He then uses a 48% nitrox mix and I'm not sure why he didn't reject the mix and get a 50%mix, but then be used 80% oxygen and there is never an excuse for that. There's been many reasons to not use 80% so I won't go into that here. Also he violated the MOD (maximum operating depth) of the gas. As for his decompression model, the argument for using vpm is stupid, however that's just my opinion. I personally think it's pseudo science steeped in fiction. A bubble check at 60m? That's very unsafe. Should have been performed at the surface not with a deco ceiling over your head. However if it was performed in both locations I have to give him props. No use of a secondary buoyancy compensation device, ie drysuit or secondary wing bladder. I also think the amount of gas he carried is only enough for him and not his buddy as well. And just what I can instantly remember from watching it once. I'm sure I would find more if I looked harder, however I'm not here to take away from his rather amazing experience. I just don't want him to get killed or worse kill someone else. There's a safe way to do these things and a not safe way. This unfortunately is the latter.

@@Chancey001 thanks for the answer, learned a lot :) have a nice day!

@@Chancey001 I'm a returning sport SCUBA diver and in the process of a refresher PADI open water course. I was amazed at your comprehensive response. I have always researched everything to death and have no desire at this point of my life, dive the barren depth shown in this video. The life I'm interested in is more in the 50 foot to maybe 80 foot range. I have to admit I was enjoying what I previously believed was a safely executed deep water dive. I never want to see anyone get hurt and I hope the divers watching this and the divers in the video, double check their dive plan. I thought diverstoday have dive computers that help to keep drivers safe. Why wouldn't their dive computer coach them through this dive as you described? Just wondering.

@@roadkingjp First things first, congratulations on returning on the sport of diving! I'm glad you decided to return back, when did you get certified first? Dives in the 50 - 80ft range require attention to detail and should be planned accordingly. However with dive computers today you can simply grab any ol' 80 with either nitrox32 or air and go for a safe dive with relatively little planning. However when the dives get extremely deep like here at 109m (~360ft) things like gas planning become extremely important. Computers today will do all the work of telling you when to ascend based on the data given. The deepest dives can be done using a bottom timer and depth gauge, I still carry one for backup purposes. A computer won't tell you to not exceed 1.4 po2 bottom mix or that your mix needs more helium because you're breathing concrete and have the mental capacity as if you had 6 martini's. The biggest part of technical diving is the predive plan. The dive does require some skill, but the real skill comes in the planning and execution of that plan and having the capacity at that depth to help your teammate.

Helium is expensive

If I remember correctly we ran out of Helium, we used all what was left. But yes higher Helium mix would have been better.

Michael Schroeder yes there’s been a lot of over fishing in that region. That’s what happens when there is no sustainable management of the natural resources

@@christophengovanduc2729 fish is meant to be eaten. I don't think fishing can be overdone, because they reproduce. I guess they must have moved location. Good job though! Wish I could dive 3 meters,

@@DerusahOti Overfishing can happen when people catch fish faster than the fish themselves can stabilise the population by reproducing. :)

R480 SCANIA "do or not do , there is no try " Master Yoda 😁

check in the description of the video, there is a link to a blog post on how to do that. Cheers.

Hi Nathan, can relate to you perfectly. I now live in Rio de Janeiro, and tech diving here is challenging. So yes I am still doing dive at 12m and sometime with low visibility and I am one of the very few doing those dives with 2 cylinders (I like now to have full redundancy for all dives, it gives me peace of mind). Looking at sea life is still my #2 motivation to go in the water, #1 being to go into a beautiful cave... :) And every chance I get, I go on a tech dive trip with my buddies at Golden Arrow. Leaving to Micronesia (Chuuk and Palau) next week with a CCR, more videos to come...

Liam Strachan : yes!!! :)

Yes!!! :)

In the super suit housing or no housing at all?

I'm also curious as to the selected gas MOD for that depth however I believe he used that to shorten deco plus not staying at that depth for too long is acceptable. I wouldn't go past 1.4 but remember, 1.6 p02 is acceptable for contingency & deco. A short stay at 1.6 (excluding deco) SHOULD be ok but the risk is up to you. The decent looked fast to me

I created a custom title and used the data from the petrel to make it change. A very long and manual process...

Ah ok. Very nice. I thought there's an option in the Petrel software or something.

+Flackymk1 portugnole.blogspot.com.br

+Christophe Ngo Van Duc awesome thanks mate :)

WIlliam Ferry : correct, this was taken during my OC trimix training. I am on CCR also now.

Gas change without any team check... This is does not seem like a safe methodology.

@@christophengovanduc2729 I'm confused. William Ferry was thinking the same thing as me: you list your gas switches as the beginning, and I was wondering how you made the gas switch question at 61 metres? At 4:42, you indicate that you're switching gases, but I don't see you changing anything. But then at 9:40, you appear to switch mouthpieces, and neither of them has the double hose I'd expect to see on a rebreather. As Wm suggests, if you're on a rebreather, it would adjust the gas mix as you change depth, would it not? And in the video, you appear to be diving a rebreather, but in your reply above, you say this was taken during OC training? Sorry for the noob questions. Beautiful video.

@@cheaplaffsarefree : So: yes I am on OC. So at 61m, I switch from travel gas which sits on my left side as a stage, to back gas (the doubles that sits on my back). I have removed the travel gas regulator from the stage from my mouth, and just took the long hose regulator that sits under my chin. There is (I think) no room for errors because the only 2 regulators around my neck are the back mounted doubles (but see haxx0r message, it seems even with stupid/clear gas changes, there is something safer ... :) ). While descending along the wall to 80m, I was tucking back the travel gas regulator. I didn't had to look too much, because I know where the things are on this setup, and I am able to do that without looking. Hope it helps and yes now on rebreather no need for gas changes.

and BTW, the deco shown on that video is VPM-B +3, with the current state of knowledge about deep stops, I would absolutely NOT recommend anybody to use VPM as a safe deco algorithm for this kind of dive. I dive now GF 50/70. Good diving.

The sunlight goes deep to 200 meters then it's the abyss.

Thanks!

I'll be diving next week (rebreather training) when I come back I'll do a blog post about that. A lot of people asking ;)

I thought it was dead too but in the flashlight beam you could see colors on the corals so they must be alive. Just no fan corals.

A lot of overfishing in this area, but it is the closest dive spot we can go easily, so for training dives we just go there.

@@christophengovanduc2729 Thnx for reply

Dan Phillips nope, my physical and mental conditions were pretty good on this dive. So until 1.6 I was in the nominal zone. I am not saying you should do it, but it was within MY personal limits. I have days when I don’t feel it, I just cancel the dive.

@@christophengovanduc2729 what do you mean feel it? O2 toxicity can make you seize without warning or feelings. Granted at 1.5 you are relatively safe for over an hour, but still, that's a large dose especially when I assume you will be doing some deco on pure o2 at some point. I could care less what risk anyone else knowingly takes, but suggesting publicly that one is able to feel the o2 toxicity thresholds before you seize is unethical.

@@mrstihl16 02 toxicity also depends on the diver. If he takes the risk and is still alive, he might be enough experimented to know if he is more or less sensitive to it. My instructor told me that some Russian frogmen were especially picked for there extreme resistance to O2 toxicity. Without getting to those cases, I may be wrong but if he tells you that he felt comfortable, taking into account his capabilities, I don’t see what’s unethical since 1.5 bar of PpO2 is not a completely horrible one (a long time ago, it was considered that O2 toxicity was at about 1.7 and today we keep between 1.4 and 1.6 depending on the agencies and laws).

Not even getting into the po2 his narcotic equilavwnt depth is like 60m on air so he was probably also narced out of his mind (because they ran out of helium and still thought it was a good idea)

Wascally Wabbit advanced open water is 30m if I am not mistaken. I think that’s what I meant in the video.

Advanced open water is 30 meters, deep diver in the recreational diver educational systems is 40 meters. Atleast if you follow a PADI or a CMAS system as many does before venture into tech dive courses.

It is indeed 30, but when i did my certification in Malta, i was told 40m and i have the 40 m dive with full instructor stamp…

He was doing a scissor kick as if he was cave diving (to not stir up silt) instead of a more relaxed flutter kick.

Up to the max it was: 6m for 25 min 9m for 6 min 12m for 5 min 15m for 3 min 18m for 2 min 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54 m for 1-2 min max, just by going up slowly it is enough to clear them. VPM-B with a +3 setting. Note: VPM algorithm is not recommended anymore for this kind of dives. I am not using it anymore. Time to Surface (TTS) at the maximum was 57 min.

To add furthermore, I did much more deco at 6m than what the shearwater was indicating, as my buddy who was on CC GF 30/70, had more to do. On total we did 40min at 6m.

See the description of the video...

definitely, more Helium would have been better, but we finished it during the fill.

@@christophengovanduc2729 Thx for the awnser, I usually see 10/60 - 10/70 mixes I will have my 60m trimix course soon, so I don't know anything yet

Some people also feel narcosis more than others. I've been down to 56m(5,148 BAR of n2) on air and been just fine.

Just read the description of the video...

Christian Bley : Yes you are correct, this was a training dive. Safe decos to you too... 😁

Training dive explanes everything. Interestingly, you can tell your stress levels rose slightly as you went deeper by the way you hold and use the camera which is totally understandable especially at 100m. Great video and wonderful music. Dive safe ;-)

You still have to do deco, a rebreather will not prevent that. The rebreather will just maintain the best mix for the depth you are at, so theoretically you will do less deco than an open circuit diver doing the same profile.

He's doing the breaststroke kick. No clue why you'd do it while diving, it's incredibly tiring.

Speedy Bob ok fine, but you dont do this in scuba diving or skin diving.Looks very amateur?

Ahmet Nurettin Hasman Only time I'd use breaststroke kick is at swim practice. It's also arguably the slowest kick. Frog kicking is the fastest, while the flutter kick you use is the second fastest and is the easiest on your endurance.

Speedy Bob 👍

@@ahmetnurettinhasman It is used in cave/wreck diving to avoid sediment from moving. A bad kick in a cave and you see nothing for days. Otherwise it´s useless to do it in good visibility conditions because it´s more tiring to do.

and aren't you afraid to lose that ring? (because it won't fit as well as on the surface?)

and why is it still so bright down at 100m? I thought blue light only reach about 70m?

If you are on a rebreather then you don’t need travel gas. You can go direct with your bottom gas and the rebreather will add the needed O2 for the gas to be safe close to the surface.

alle_namen_schon_vergeben Carribean waters. That’s why it so bright down there.

alle_namen_schon_vergeben what ring?

Yes, normally the GoPro is rated for 60m max, I decided to try and keep it recording while below 60m and see what would happen...:) I upgraded my Gopro 3 now to a Gopro5 with a 100m rated diving housing

@@christophengovanduc2729 this was the answer that i was looking for :) i have a 60 m housing and I dont think I will ever need anything deeper than that :)

Larry Dumlao a gopro3

Really a gopro 3 rated to 60m is capable to go 100m + ?

@@daviddoyle9310 well, I am not recommending anything here obviously, do at your own risk. I was prepared to loose mine during that dive, but as it turned out, it worked.

Oui, c'est la même chose

It is ppO2 in English as well it is usually shortened to PO2

OUIIII ENFIN DES FRANÇAIS

at the max TTS (Time to Surface) is 46 min

This was filmed with a gopro3 at the time. I try to get back a little bit the color in post in final cut pro by using a channel mixer filter. I don't use a red filter at all.

probably a piece of the wreck of the capitan alcina, the wreck is quite all over the place now. DR has been quite over fished, there's not much in that place unfortunately. But it's close to the capital, so easy to reach for the locals to dive.

Why not? The deco schedule on CCR is far more optimal, than on OC. So in case of emergency from the deepest point, you need to do less deco, that the OC diver. I have simulated it with current scenario: CC down, 10 minutes bottom time at 108m. Then bailout with Tx12/60, switch to Nx48 at 21m, switch to Nx80 at 10m. Ascent rate 5m/min, total bailout deco time 25 minutes (total run time 46.5 minutes). Bailout gas consumption Tx12/60 1155 litres, Nx48 250 litres, Nx80 507 litres, RMV 17lpm. That corresponds to cca 100 bar from Tx in S80, 45 bar from Nx48 in S40 and 100 bar from Nx80 in S40. So far so good, no? Still 100% reserve. Edit: the diluent i used was Tx10/70

How about Isobaric counterdiffusion? What algorithm did you use for that short deco schedule ? What's the travel SP and what was the deep SP?

Salut, tu peux contacter Denis sur denis@cavediving.com.do

@@christophengovanduc2729 merci mais le résultat est England moi je ne connaît pas l'anglais comment faire je?

Ok boomer, not german precision for sure. seeing your trim in your tec40 video during deco, i still feel good about my dives execution.

@@christophengovanduc2729 that`s strange as I am not in any of the videos. There are some students in training though, whose buoyancy and trim improved 100% by the end of the course.

Michael Turner how convenient...

and that statement is validated by?? from what I can remember Heliox as a high tendency to HPNS below 100m and as it diffuses more rapidly in the body than nitrogen, you might need longer decompression at shallow depth. This is deco diving not saturation diving.

you are so awesome