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13 May 2008, 11:38 PM | #31 |
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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.
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14 May 2008, 12:13 AM | #32 |
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14 May 2008, 04:23 AM | #33 |
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14 May 2008, 08:10 AM | #34 |
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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.
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14 May 2008, 08:38 AM | #35 | |
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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
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14 May 2008, 10:41 AM | #36 |
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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.
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14 May 2008, 11:22 AM | #37 |
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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.... |
14 May 2008, 11:27 AM | #38 | |
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what were you doing down there? |
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14 May 2008, 11:39 AM | #39 |
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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.
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14 May 2008, 06:40 PM | #40 |
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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.
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14 May 2008, 08:50 PM | #41 | ||
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Quote:
Thanks Sean
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14 May 2008, 10:56 PM | #42 | |
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15 May 2008, 12:48 AM | #43 | |
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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.... |
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15 May 2008, 01:54 AM | #44 |
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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.
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15 May 2008, 02:00 AM | #45 | |
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Sean
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15 May 2008, 02:04 AM | #46 |
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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'.
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15 May 2008, 02:08 AM | #47 | |
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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... |
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15 May 2008, 02:53 AM | #48 | |
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15 May 2008, 03:00 AM | #49 |
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ohhh so true!
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15 May 2008, 01:38 PM | #50 | |
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What was I doing down there? Looking at this: And this: In this:
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15 May 2008, 01:43 PM | #51 |
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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.
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15 May 2008, 03:16 PM | #52 |
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All those pics and not one of 'em with a wrist shot, shame.
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15 May 2008, 08:35 PM | #53 |
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This turned into a fun and informative post... Thanks guys
Sean
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15 May 2008, 08:49 PM | #54 | |
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Pronouncing the number "4" sounds like pronouncing "death" in Chinese, so it says.
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15 May 2008, 09:56 PM | #55 | |
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i've been to a bit over 1000ft in a 3 man, and that was exciting; cant imagine what this would have been like. |
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15 May 2008, 10:20 PM | #56 | |
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Not true at all
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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. |
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16 May 2008, 03:01 AM | #57 |
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so was that on the mir 1/2?; looks like pics of the titanic.
how did you get to be on that expedition? |
16 May 2008, 03:34 AM | #58 | |
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Watch the History Channel: Titanic Final Moments - Missing Pieces Click Here for More Info Sean
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16 May 2008, 09:39 AM | #59 | |
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Limits of Mixed gas Diving
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16 May 2008, 01:08 PM | #60 | |
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