TRIMIX Diving to 120 meters 400 feet // Does it make sense?
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- čas přidán 4. 05. 2023
- Open circuit trimix diving to 400 feet (120 meters) is a logistically complex and costly endeavor. So does it make sense? In this video we're exploring some of the key concepts that are essential for understanding the complexity of these deep trimix dives.
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Congratulations for this video. I'm a technical diver and I always love when I found excellent videos like this one about the basic concepts we need to know in our sport. Good information like these can bring more divers to Tech
Wow! Thank you! It's not every day people take the time to leave positive comments like this! Very much appreciated! If you haven't already, consider subscribing to the channel because this Friday we have another Tech episode!
Subscribed and waiting the next episode! Keep doing this kind of high level content !!!!
Thank you so much for this video really appreciated
You are so welcome!
Very interesting video. Technical diving seems expensive in terms of gas and equipment, plus a high cost for any mistakes made. Looking forward to getting my recreational diving certification soon but probably not looking to do technical diving. Still interesting to see the challenges and level of planning you guys do.
You got a sub from me. Purely rec diver here, but the combination of both high production value and deep technical knowledge is a rarity on scuba CZcams! Thanks!
Thank you! I really appreciate that!! 👊
Amazing video! Thanks for sharing!
Thank you! I really appreciate the positive feedback!
Are you considering ICD on your ascent schedule? Huge gas swings on the first switch. Plus it's a long way from 120 M to that first gas switch. Would you consider 10/70 as your bottom gas? add then a 15/55 for travel then a 25/35 followed by 50/15 and O2. This increases the helium bill, but stills the ICD . This is why divers choose Rebreathers :)
Thanks for the practical information. That's always appreciated! I rarely put helium in the deco mixes because the benefit is mostly theoretical but the cost is very real. However, bringing a 15/55 or similar along the way is a good idea for sure!
ICD isn't a problem since it's a bounce dive, and no helium in the suit. Your gas choice is overkill. Especially the O2. Did you run it through Multi Deco software?
In the diving plan ascent from 54m to 21 m is triox 25/12.This is unacceptet becouse contex of N2 is much more then trimix11/60
Great Video! Well explained with a lot of information in a very concise way! 👏👌
Thank you Peter! That's much appreciated! 👊
I’ve been considering Helitrox just for reducing the narcosis for OC cave diving. I wrapped up advanced nitrox and deco procedures in a rough environment recently with fairly cold water and bad visibility from 7’ on the bottom down to under a foot on our 30-10’ deco stops. Different environments and task loading. Definitely makes the Helitrox worth it for me, but even those prices I think at some point for cave and deep I’ll wind up on a sidewinder or choptima unit. great video.
I agree with every single one of your points there! 🙂👊
What a fantastic and informative video! Thank you, Nick, for sharing your knowledge. Your channel is a gem, and I must say all the contents are top-notch. You deserve more recognition and reach. Keep up the great work! Sending love from Sri Lanka!!! 💌
Woah thank you so much. I really appreciate it! Thank you for watching and for taking the time to encourage. That means a lot! 💙🇱🇰
Nice! Keep it up!
Thank you!
Make so much sense to use a CCR for those kind of dives. To not suck your tanks in minutes and to not see your money transforming in bubbles haha. Would love to do it anyway, even in OC 😎 Great video!
Yeah absolutely! It's a bit my point at the end of the dive that it's futile 😄
Really interesting video. I am recreational diver . Personally for me going too deep I won’t see the marine life but saying that going deeper you will find deeper wrecks to dive.where I am limited to 40m . Also it’s the cost of training need to buy new gear and the expense of the gases that puts me off .But that’s my opinion. Crazy amount of deco stops you had to make . Also very interesting why the use /depth when to change gases and why you had too . Thanks really appreciate that video 👍
Thank you! I enjoy technical diving but you're right that recreational diving definitely has its merrits too!
Awsome video. Nice, logical explanation why and why not :) Thank you. btw. nothing pointless in passing own limits.
Thank you! That's really encouraging and I appreciate that! 👊
Very informative. I'm learning so much from your videos! Looking forward to more! Keep up the great work!!!
The vis is amazing down there
It is!
Awesome series! I have a similar one coming, but I have a strict rule that we do not share our exact deco plan/schedule. Believe it or nit people will just copy yours, instead of planning their own with software ect
Thank you! I definitely see why you have that rule but unfortunately if people want to be stupid they can be stupid I'm afraid. With our without our help!
@@DiveSAGA I wish the law and getting sued worked that way
END of 42m in the bottom phase is quite a bit worse than what most technical diving organisations recommend (30m). It's a real risk to be narked when diving deep.
Have your lungs tested for burst pressure.
Doing my PADI Tech 40-50 this year in Bonaire. Curious your thoughts on doing it in sidemount vs doubles?
I would do it in doubles and later cross over into sidemount. That way you eventually know both, and I find starting off in doubles slightly less taxing.
Do it on doubles with TDI and not PADI
Do not use PADI for Tech. Use TDI or PSAI - unless you are already have 100 dives on sidemount then start on doubles
I’ve been thinking about Utila for an exotic trip. Is it worth the trouble of getting there?
😊
This is my dilemma right now, Tec 50 qualified with 100 plus tec dives total. Need to decide if I go onto Tec 65 and beyond OC or switch to CCR and basically having to start over with training etc to get back to the deeper depths. 🤔
Yes I fully understand. OC Trimix diving is wildly interesting but beyond 70-80m / 230ft it really makes more sense to go CCR
IMHO it just depends on a few things. How young are you? I just turned 62 so I made the decision to stay OC. As you said, you have to start over. Do you have the time to put the hours on the CCR unit necessary to do the Trimix training. I am 2.5 hours away from my training quarry and when I ran the numbers I figured it would take at least one season of diving every week just to get the hours on the unit to start the deep training.If I was in my 30's-40's I would for sure go CCR.I did a 5 day charter in Lake Superior and I brought 2 sets of doubles, a T-Bottle of Helium and assorted bottles of deco gas. My buds who were CCR carried their gas on the boat in a small plastic milk crate. Something to think about.
I’m early 40s so should have a few more years in me yet. 😂
I’m in the UK so sites are limited for 50m+ id mainly be traveling with it to get anything deep.
Off to bikini later this year which will be OC but often in the Red Sea and thinking of doing truk in a couple of year.
Hello! Great video. I have a question about your G2Tek dive computer. At bottom depth it indicated “Switching to Gauge mode”, did you expect this? I am planning on renewing my dive computer and was thinking about this G2 or a Perdix. What is your opinion about these two options? Thanks!!!
Yes that's a warning. The G2 Tek has a maximum depth rating of 120m so beyond that they don't want to be responsible for supporting the dive. If you plan on diving deeper, you should look for a different computer indeed.I also have a G3, which has a max depth of 300m.
@@DiveSAGA Thank you very much for the response!
Gas management is ...... The 22 ltr twin set for the bottom and the distance from 120 meters to the first deep travel is 70 meters..... Does PADI consider it safe gas management?
Hello Nick - great movie, I see you used regular diving boat for this adventure, do you think with correct preparation it was possible to use regular yacht to attach explosives on Nord Stream pipeline in september 2022? cheers 👋
I'm not a military expert but while the blown up section of the pipeline lies at depths that divers could reach, I think the preparation and precision required for such an operation, probably require a military platform with adequate surface support. Something that would be difficult to organize from a regular yacht. But who knows 🤷♂️
Deep OC trimix is a dying art in my opinion. Why not reap the benefits of CCR for this type of dive?
Yes that's kindof my opinion exactly!
Exactly
Because if you have to bail out, you need to know how to do it.
@addohm , completely agree with Bail out. However, a dive to 100m or more will always use OC or BO CCR for Bailout. I was referring to performing the entire dive on OC. Which is wasteful and less efficient than diving those depths on CCR.
@@addohm you can bail out with another rebreather
Which gas did you use to get down to 120 meter? Thanks👍
I usually use my 50% as a travel gas (need to calculate a little extra volume) and then switch to the Trimix when it's no longer hypoxic.
Any reason to not do it on CCR? Other than not having a CCR?
No
I wonder at the profile with something easy to mix like 10/50 and a ccr. I'll have look. It was 10min at 120m. And for others saying the same thing, for this, why dive OC?
Yes but the conclusion of the video is exactly that, that OC deep Trimix diving is indeed a bit of a pointless endeavor.
OC for me is the best gear.
It was actually alittle over 3 minutes at 120m , the remaing 6minutes plus was the descent. So for this sort of dive you could get away with using 10/50 on ccr, but for anything longer say you are diving a wreck in cold darker waters for 25 minutes bottom time then you would want more Helium. You have to coinsider the equivalent air density of the bottom gas you are breathing, especially more so on rebreather with the risk of build up of CO2 , along with narcosis. You need your head feeling and functioning like it is when sat in your living room when diving a rebreather at these depths.Also the O2 is a little high at max depth if you need to dil flush.
Guys I don't get it.
4:58 - You just say it is really bad idea to breath that mix at the surface
11:09 - However, MultiDeco screenshot told us you are start using Trimix 11/60 from surface to all descent and ascent before first deco stop (57m)
On Multideco you'll see a red bar on the first line. That's to indicate that that gas is hypoxic at the start. It's then at your discretion to choose what alternative gas to use for the first few meters.
@@DiveSAGA i Realy like your video! But i need to say that the collection of gases you used are not good for your health when you consider isobaric counter diffusion. The Increase of N2 is way to high... please consider to remove the gas specs out of your video. There are people who will likey follow that specs.
These gasses are super common across the industry. What gasses do you propose for this dive?
10/60 bottom gas, 32% travel, deco/80% @@DiveSAGA
you breathe for 33 minutes, 100%. without stop? Saw you had no breaks on pure o2? on the dive planner.
Well observed. The plan as shown in the video doesn't show airbreaks but we did indeed insert an airbreak manually during the O2 session.
They are point less. most of the cultural you can see or will see disappear at 60 meters.
I understand the excitement of diving deeper . But personally, after couple try, I got tired of it, the risk is just too big for 10 mintues bottom time.
Yes I mostly agree. Everyone's limits are different of course. For me it stops being worth it around 70-80m
400 feet is the deepest part of our oceans? lmfao. Barely scratched the surface.
Hyperbole:
/hʌɪˈpəːbəli/

noun
exaggerated statements or claims not meant to be taken literally.
Tatters on gas
Great video. I am also certified as TDI Advanced Trimix. Never did any warm water deep dives. Looks like a blast. Last deep dive I did was at Isle Royale in Lake Superior. We dove the Kamloops which is at 270ft. Water temp in July was 36 degrees top to bottom. I did have a question. When you switch to 100% at 6 meters do you do the whole 33 minute stop there. My Shearwater goes kinda crazy if I stay on O2 that long at 20 ft. Usually I move up 10 ft for the last 18 minutes to keep my PPO below 1.6 Again great video. Might give this place a try this year.
Hi! Thank you! Yes the water temp here definitely helps 😁 We manually insert an airbreak on the 100%, I just didn't include it in the video to help simplify it a bit. I usually also set my computer with last stop at 3 and then we see if the conditions facilitate a shallower last stop (which they usually do).
$500 a cylinder per dive...no thanks; and slinging all those tanks makes you look ridiculous 😂 😂 😂
And how would you rig your cylinders to be a cute diver?
You can do that depth slinging two tanks for deco.