Deep Sea depth rating = 4482m/14710ft ??

[neilgader]

Originally Posted by JJ Irani

Nothing on earth can survive such depths.....except some very specialised deep sea creatures that have been adapted by Mother Nature!!

Well, after all, even sea creatures might occasionally need to know the time. I'd wager that after a few years on the market there'll be more than a couple of DSSD bumping around at that depth much to the chagrin of their Rolex-less owners. It's bound to happen. In fact it might be an interesting thread to find out how many Rolex owners would admit to losing their SD or Sub on a dive.

[jgreene1672]

Originally Posted by seantk

A NATO strap might work

Sean

That and a whole lotta luck

[JJ Irani]

Originally Posted by redshirt1957

Maybe I will use my SD as bait and see what kind of sea creature I can catch.

[Subfiend]

3,900 meters (12,800 ft) is about the average depth of all the world's oceans, and this probably had something to do with the idea to make this the depth rating.

I think your pressure calculation is a little off. I have been to both 12,500 ft and 16,000 ft in a submersible. The pressure at 12,500 is approximately 6,000 psi. The pressure at 16,000 ft is approximately 8,000 psi.

There are a lot of working class ROVs that are depth rated to 3,000m, but not nearly as many that can go to 4,000m and beyond. The reason is there is not much demand for this depth rating, so why spend the extra money to achieve it? Most oil exploration and extraction is done at depths of less than 3,000m, and this is where the primary demand is for ROVs.

Currently, there are only three submersibles worldwide that are capable of diving to 4,000m+. Realistically, now there is only one -- the Japanese Skinkai. The others are effectively off-line.

So, to answer your question, there is no need for a dive watch to have the depth rating of the new DEEPSEA. But I still want one. At least I have been done that far.

[seantk]

Originally Posted by Subfiend

3,900 meters (12,800 ft) is about the average depth of all the world's oceans, and this probably had something to do with the idea to make this the depth rating.

I think your pressure calculation is a little off. I have been to both 12,500 ft and 16,000 ft in a submersible. The pressure at 12,500 is approximately 6,000 psi. The pressure at 16,000 ft is approximately 8,000 psi.

I will stand by my calculation, however it assumes 14.7 PSI for each atmosphere (33 ft) of sea water and would not take into account any varying density of the water. I confirmed this with a depth and pressure converter as well. These are just numbers on a calculator and cannot replace the actual pressure you witnessed first hand at those depths.

I would also like to believe the reason for the 3900m/12800ft rating of the Deep Sea is because it is the average depth of the worlds oceans - pretty cool

Thanks for the insight

Sean

[Andad]

I am looking forward to seeing it and trying it for size but at Aus$10000 I'm damned sure I wont be getting it wet.

[Markg]

Originally Posted by seantk

The MTM Black Seal watch is depth rated to 12000M (39000FT)

its kind of funny they call it a black seal watch, since the typical navy seal doesnt see much more than 40 feet on a rebreather, either setting explosives or stealth landing somewhere hot.

now maybe they meant a black "harbor" seal? wouldnt make much sense to call it a black "gray" seal....

[Markg]

Originally Posted by Subfiend

3,900 meters (12,800 ft) is about the average depth of all the world's oceans, and this probably had something to do with the idea to make this the depth rating.

I think your pressure calculation is a little off. I have been to both 12,500 ft and 16,000 ft in a submersible. The pressure at 12,500 is approximately 6,000 psi. The pressure at 16,000 ft is approximately 8,000 psi.

There are a lot of working class ROVs that are depth rated to 3,000m, but not nearly as many that can go to 4,000m and beyond. The reason is there is not much demand for this depth rating, so why spend the extra money to achieve it? Most oil exploration and extraction is done at depths of less than 3,000m, and this is where the primary demand is for ROVs.

Currently, there are only three submersibles worldwide that are capable of diving to 4,000m+. Realistically, now there is only one -- the Japanese Skinkai. The others are effectively off-line.

So, to answer your question, there is no need for a dive watch to have the depth rating of the new DEEPSEA. But I still want one. At least I have been done that far.

im a little confused, since this seems to be mixed between ROVs and HOVs. not many people have ever been to those depths in an HOV, and ROVs dont take people (hence 'remote' operated vehicle vs. 'human' operated vehicle).

what were you doing down there?

[JCLZ]

I think the depth rate shown on the DSSD will have to do in part with numbers. I know some numbers when you pronounce them will sound like negative words in some cultures. Rolex will chose a number that is world wide accepted so it can sell in all markets without worries.

[moby33]

Originally Posted by Markg

its kind of funny they call it a black seal watch, since the typical navy seal doesnt see much more than 40 feet on a rebreather, either setting explosives or stealth landing somewhere hot.

Wrong. You're off by about double. Unless you want to be dead from O2 toxicity, you'll never be operating at that depth on a rebreather...trust me, I know a thing or two about this topic.

[seantk]

Originally Posted by Markg

its kind of funny they call it a black seal watch, since the typical navy seal doesnt see much more than 40 feet on a rebreather, either setting explosives or stealth landing somewhere hot.

Originally Posted by moby33

Wrong. You're off by about double. Unless you want to be dead from O2 toxicity, you'll never be operating at that depth on a rebreather...trust me, I know a thing or two about this topic.

Reading this post, you are implying that you can never dive deeper than 20ft while using a rebreather. Did I misread this?

Thanks

Sean

[bwalkerVintage]

Originally Posted by roadcarver

What's the point of such depths? Will a diver be able to survive such depths?

Originally Posted by JJ Irani

Nothing on earth can survive such depths.....except some very specialised deep sea creatures that have been adapted by Mother Nature!!

It is so all the DSSD/SDDS Rolex watches that were dropped overboard will survive forever!

[Markg]

Originally Posted by seantk

Reading this post, you are implying that you can never dive deeper than 20ft while using a rebreather. Did I misread this?

Thanks

Sean

rebreathers are used to save oxygen, AND make yourself stealth.

navy seals use it primarly for stealth (no bubbles), and dont normally need to dive very deep at all (again, stealth so just deep enough not to be seen or to set the explosives if they are doing demolition).

on the other hand, cave explorers are trying to save oxygen due to the depths involved (some at 300+), and so its usefull there as well as you only use the oxygen you breath, as opposed to open circuit scuba where you dump most of the air into the ocean when you exhale.


same unit, different benefits depending....but they called it a seal, so i was just pondering....

[moby33]

Originally Posted by seantk

Reading this post, you are implying that you can never dive deeper than 20ft while using a rebreather. Did I misread this?

Thanks

Sean

I wasn't implying, but stating emphatically, you will never go to 40' on a pure O2 rebreather unit...unless of course you want to kill yourself.

[seantk]

Originally Posted by moby33

I wasn't implying, but stating emphatically, you will never go to 40' on a pure O2 rebreather unit...unless of course you want to kill yourself.

Thanks for the clarification

Sean

[moby33]

Originally Posted by seantk

Thanks for the clarification

Sean

No problem. Actually, my statement isn't entirely true (if we have to get 100% technical)...you can go deeper than that depth rating, but only for a limited amount of time. General rule of thumb is for any type of sustained operations using pure 02 rebreathers, you should not exceed 20-25'.

[Markg]

Originally Posted by moby33

I wasn't implying, but stating emphatically, you will never go to 40' on a pure O2 rebreather unit...unless of course you want to kill yourself.

ALL rebreathers use "pure" O2. i think you meant rebreathers that ONLY use "pure" O2.

most all rebreathers also use, in addition to pure O2, a diluent gas like nitrogen or helium, and the O2 pressure is regulated to eliminate oxygen toxicity. sometimes not well enough...

[moby33]

Originally Posted by Markg

ALL rebreathers use "pure" O2. i think you meant rebreathers that ONLY use "pure" O2.

most all rebreathers also use, in addition to pure O2, a diluent gas like nitrogen or helium, and the O2 pressure is regulated to eliminate oxygen toxicity. sometimes not well enough...

Exactly...my choice of words is not always the most clear, 'pure' was meant to be read as 'only' or 'strictly' (it sounded correct in my head...probably one too many times breathing gas underwater)

[pwrslider]

Originally Posted by DSJ

You said it! Something that doesn't keep as good a time as your cell phone could be considered a useless feature, yet we pay thousands!!!

I love Rolex!

ohhh so true!

[Subfiend]

Originally Posted by Markg

im a little confused, since this seems to be mixed between ROVs and HOVs. not many people have ever been to those depths in an HOV, and ROVs dont take people (hence 'remote' operated vehicle vs. 'human' operated vehicle).

what were you doing down there?

Sorry for the confusion. I was talking about ROVs in one paragraph and HOVs in the next.

What was I doing down there? Looking at this:



And this:



In this:

[Subfiend]

You're right that not many people have been to these depths. Less than 50 have been below 15,000 ft. (the number is probably less than 30, but 50 is a safer estimate). Only about 150 to 200 people have ever been to 12,500 ft.

I have been below 40 ft. on a rebreather too.

[jgreene1672]

Originally Posted by Subfiend

Sorry for the confusion. I was talking about ROVs in one paragraph and HOVs in the next.

What was I doing down there? Looking at this:



And this:



In this:

All those pics and not one of 'em with a wrist shot, shame.

[seantk]

This turned into a fun and informative post... Thanks guys

Sean

[SPACE-DWELLER]

Originally Posted by seantk

I was curious as why Rolex chose 3900m/12800ft since the Deep Sea had been tested deeper (more pressure). I know there were posts that suggested the 12800 had to do with Chinese numerology, however I would like to believe that it has more to do with actual depth of an Ocean.
(...)

And "4482m/14710ft" would be quite unlucky numbers in China due to the 4's.

Pronouncing the number "4" sounds like pronouncing "death" in Chinese, so it says.

[Markg]

Originally Posted by Subfiend

Sorry for the confusion. I was talking about ROVs in one paragraph and HOVs in the next.

What was I doing down there? Looking at this:



And this:



In this:

im impressed!

i've been to a bit over 1000ft in a 3 man, and that was exciting; cant imagine what this would have been like.

[vjb.knife]

Originally Posted by jgreene1672

A diver could never survive at the maximum depth for a submariner, and if thats overkill imagine the deepsea.

I like it, but your paying alot for a completely useless feature, but then again who really needs a rolex...?

The last time I checked my Submariner it was rated to 1000 feet.

The record dive is 701 meters or 2300 feet by Comex divers over ten years ago.

I dove many times to 600+ feet way back in the 1970's and I know several guys who are routinely diving to 1000+ feet currently.

[Markg]

so was that on the mir 1/2?; looks like pics of the titanic.

how did you get to be on that expedition?

[seantk]

Originally Posted by Markg

so was that on the mir 1/2?; looks like pics of the titanic.

how did you get to be on that expedition?

Mark,

Watch the History Channel: Titanic Final Moments - Missing Pieces

Click Here for More Info

Sean

[vjb.knife]

Originally Posted by Aqua fobic

Mixed gas divers on the other hand do work at depths of 250m sometimes 300+ but the practicalities of these depths make it uneconomical to do so. The main problem is you have to reduce the amount of Oxygen in the mix from the normal 21% we breath now down to around 1% @ 300m. The body can stand greater depths, after all we are 90% water anyway, its the reduction of Oxygen thats the limiting factor.

Having said all that at least the DSSD is safe in the shower

Gas mixing technology is better than it used to be when I was in the game in the 1970's and is not that big of a deal now. The expense is the limiting factor along with the fatigue that sets in just from breathing at great depths. Even at 200 meters the breathing gas seems like it is very thick and it makes breathing it in and out much more of a chore than on the surface. At 500 meters it is said that it is work just to breath. It increases the fatigue and risk to the Divers greatly. After about two years of saturation diving work in water 200+ meters I was ready to get out of the business but just left sat work and worked in the Gulf of Mexico and on the East coast for another few years but in nothing over 100 meters and a lot of it in less than 100 feet. Then I was able to pay to go back to college.

[Subfiend]

Originally Posted by seantk

Mark,

Watch the History Channel: Titanic Final Moments - Missing Pieces

Click Here for More Info

Sean

Uh, please don't watch that show! It's fiction. Go to the web site in my member profile. That tells you everything you need to know.