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Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

This topic was created by Lewis Page 1 .

Boffin

Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

Realistically, is there any point in a diving watch rated for more than 300m? Even for a saturation diver that ought to be OK, and for any other kind of diver more than OK. Surely if you wear a Rolex Sea-Dweller, Doxa 1200 etc you are almost certainly a poseur. I never dived deeper than 80m in an 8-year spell as a Royal Navy clearance diver. I wear an ordinary Omega Seamaster 300m model - not wind-up, either. Even that's a bit of a pose for me to wear - especially the helium release valve, which I never needed. And most divers have even less need for a smega diving watch than me.

Sure, sat divers exist but there aren't that many of them: and not that many of them go beyond 200m very often. The existence of production watches rated for more than 300m is just silly, and nearly everyone that wears one has to be, basically, a bullshitter - right?

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Vic
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Re: Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

> is there any point in a diving watch rated for more than 300m?

It depends on the rating.

If 300m meant 300m, then no. The decompression penalty[1] for a 300m dive would make it pointless.

But watch manufacturers don't use metres like you and I do; a watch marked as "20m water resistant" means you can use it in the shower. A watch marked "100m" should be good to 15m.

I wear an Apeks-branded watch rated to 200m. I've taken it to 50m; I don't think I'd go any further.

Vic.

[1] Doing a silly 1-minute bounce to 300m on air on ZHL16B with no GFs or intermediate stops gives a total dive time of 19 hours 26 minutes. If I put some He in the mix (5/84, for an END of 33m), we're up to 35 hours 30 minutes. This isn't viable.

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Re: Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

> Doing a silly 1-minute bounce

I should have mentioned I'm not using deco gases in this computation. With 21/50 and O2, that 35 hours can be reduced to 16 and a bit. I'm still not doing that dive...

Vic.

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Re: Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

Well sure - but I'm on about 500 or 1200 or god save us 12000m watches. 200m ones, fine - 300m ones if you're a pro, fine.

But we seem to be agreeing that anything beyond that is pretty silly.

I once had a pusser's watch supposedly rated for 200m flood up on me at only 40, so sure there are a lot of duff watches out there which don't live up to their spec. Fortunately in Navy diving it's mostly the supervisor on the surface who needs to know the time rather than the diver in the water.

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Vic
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Re: Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

> Fortunately in Navy diving it's mostly the supervisor on the surface who needs to know the time

One of the many differences between military and civilian diving; we tend to carry the dive plan with us. Which makes life interesting with a headful of nitrogen :-)

Here's the last Navy boy I dived with. He did my IANTD quali. I was properly off my tits on the Salsette :-)

Vic.

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Facepalm

Re: Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

"Surely if you wear a Rolex Sea-Dweller, Doxa 1200 etc you are almost certainly a poseur."

Who the hell do you think they make five thousand dollar watches for? Not people who _need_ them.

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Anonymous Coward

Re: Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

Water resistant ratings like 200m are static pressures. If you move a watch around in water or hit/splash it with water (shower, hand washing, etc.) then you will need a higher water resistance rating than you might expect.

As a though experiment, if you train a fire hose on a watch, it will need to be pretty damn water resistant even though it's still above ground...

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Vic
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Re: Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

> If you move a watch around in water or hit/splash it with water

> (shower, hand washing, etc.) then you will need a higher water

> resistance rating than you might expect.

The watch manufacturers came out with that argument many years back.

Do the numbers on the increased pressure on a watch from the force exerted by moving your arm through the water. Yes, it is a positive increase. No, it doesn't make any difference.

Vic.

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Re: Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom

That's what I've been told by my local jeweler recently, but I still have my trusty Dugena Nautica T-200 and back in the days we tested it with a 200m line in the northern atlantic. That was used to take water samples from different depths to measure salt to improve our sonar. We recorded 187 meters and the watch came up fine.

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Thumb Up

agreed

My bottom of the range Tag is "rated" for 200m - the deepest its gone or ever likely to go is around the 30m mark - and frankly that was on a qualification dive. Most of my interest is between the 5-25m mark.

I would have been quite happy with Tag rated at 50m but they dont exist.

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Re: agreed

It's semi irrelevant, but before I got the Seamaster I used to wear a Tag rated for 200m. The bracelet pins broke during an ordinary 50m nitrox dive though and I lost it, which put me off rather. The one 'diver' feature I found useful on the Seamaster was the extendey bracelet for wearing over your suit, though.

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WTF?

Re: agreed

50m on Nitrox - as in more than 21% oxygen? What partial pressure of O2 is that?

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Re: agreed

We used to dive to 54m on the old DSSCCD using 32.5/67.5 nitrox, so you were talking max ppO2 of 2.08 bar. This dated from the olden days when people were a bit less panicky about O2, of course! Diving the same set rigged for pure O2 (for attack swimming) we had a depth limit of 8, then 7 m in my time, though to be honest the depth gauges we had were so hard to read at night we would violate that fairly often.

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N2
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Re: agreed

Agreed,

The deepest mine has ever gone is 25m, but

They also have a very scratch resistant sapphire glass face and after some 15 years in the propulsion department of a nuclear submarine, mine has not a mark on it.

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Well, people wear sunglasses after sunset

It is about as useful. And how many people own a Porsche and never drive it faster than half the speed it can go? Then we can talk about things that are expensive but have no use at all. Diamonds, for instance.

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There are uses for diamonds

Industrial abrasive, for one thing. Me, I suppose maybe people like the idea of their timepiece maintaining its function even after their carcass has ceased to do so as a result of excessive undersea pressure? Of course you'd then have a need for a "Mark Time of Death" function which would be automatically supplied by a cheaper chronometer, so...

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Re: There are uses for diamonds

I'm sure I've heard a story about a guy who fell under a waterfall and the body got trapped by some rocks. It was ages before anyone found the body, but when they did his Rolex was still working perfectly, and the motion of his arm bobbing around in the water has been enough to keep the self-winding mechanism going.

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Dunno about all that, but it does seem a shame the robot arm wasn't rated to the same depth the robot watch was.

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Coat

Well - yeah but

The phrases "recreational diver" and "testosterone soaked poseur" are pretty much interchangeable - in my brief time as a club diver my need for shiny reached quite ridiculous levels.

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EWI

"and vanquish an alliance between the US military and an oil company"

Lewis hasn't even watched The Abyss. has he?

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Re: "and vanquish an alliance between the US military and an oil company"

Neither has anyone else.

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Re: "and vanquish an alliance between the US military and an oil company"

Of course I have. You remember, alien technology from the Abyss makes a US navy submarine go haywire. The military calls in help from Ed Harris' guys, who - if memory serves - are civvies in a megadeep sat platform operated by the oil biz ('Benthic Petroleum'). Later some Navy SEALs come down to the platform and start throwing their weight about like the evil military sorts they are. The boss goes off his rocker and tries to nuke the aliens using an ROV from the oil platform and a warhead from the sub, though one of the oil guys (Ed Harris) manages to stop this.

At the end we find that the aliens were fixing to wipe out humanity for being so evil and warlike (that'll teach us, it's the only language we understand). Meanwhile a huge naval fleet has gathered up top. The aliens decide to let most of us off being killed because of Ed's love for his estranged wife. However they still bring their huge ship/city thing up to the surface, knackering the assembled military/oil biz shipping there. Vanquishing them in fact.

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Coat

"Meanwhile a huge naval fleet has gathered up top."

Only in the director's cut.

Oh gawd, I'm such a geek :-(

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Holmes

Sunken treasure

But, just think of all the still working watches our future generations will be able to retrieve from the depths thanks to these advancements. These may well go on to become the future time pieces of choice for a generation of poseur space explorers.

For the more budget conscious, the same effect can be achieved by filling a submarine full of watches for future generations to find.

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Dunno

How much no pressure are divers' watches rated to stand?

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Re: Dunno

As "no pressure" is one atmosphere different from sea level- I doubt it would be a problem. Omega also supplied the watches to the Apollo crew - so they have done a few hours in a near vacuum, hot, cold, hot cold etc. AFAIK they all still work, 40 odd years on.

Lewis has already picked up on the single most useful feature of the Seamaster (not the Helium release valve, I have no idea who uses that) but the strap expansion.

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Boffin

Re: Dunno...Zero to One?

Fry: "Hey perfesser, how now that we're submerged, how many atmospheres of pressure is this thing designed for?"

Prof. Farnsworth: "Welllllll, since it a spaceship, I suppose zero to one.......(trailing off in contemplation)"

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Re: Dunno

I have a Seiko Orange Monster that also has a strap extension. What it doesn't have, though, compared to the expensive dive watches, is sapphire (or any other really hard crystal) "glass".

Mine is not too bad, the stainless steel strap is a lot more scratched than the glass, but the glass is beginning to show its age. If you have the money lying around, a tougher glass is probably worth it.

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Re: Dunno

2nd and 3rd this. My tag is 10 yrs old this year - strap has a few scratches - glass is still pristine even after constant wearing including for diving, DIY and using heavy machinery. Best watch I've owned bar none. And cheap over ten years.

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Re: Dunno

Helium release valves are for saturation divers. You spend weeks on end 'in the bin' under a mega pressure heliox atmosphere, the teeny helium molecules leak slowly in even to your super diver watch's case. After a while the inside of the watch ist at quite a high pressure, full of helium.

When you finally start decompressing, the helium can't get out quickly enough and your super watch blows open (it being designed to resist pressure from outside not inside). Hence you have a valve to let out the helium while the sat pot is decompressing.

I'm told it's a good plan to make sure all your fillings are in good nick when sat diving, as sometimes the space under a filling can act in the same way as the watch case, causing massive pain as you decompress or even causing the tooth to explode.

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Anonymous Coward

Re: Dunno

The problem with sapphire is that it's extremely hard (you basically can't scratch it, unless you're using a diamond) but it's also more brittle than other common watch crystal materials.

So your more serious sports/extreme conditions watches will actually have mineral glass crystals or, more likely, plastic crystals. Easy to scratch but unlikely to shatter and let the elements into the delicate innards.

FYI, the Speedmaster used in the moon landing had a plastic crystal, although if you buy a new one these days it will have a sapphire crystal since not many people will put up with a $3000+ watch having an easily-scratched plastic crystal worth less than $1.

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Joke

Pristine bottom

Except for the graffiti scrawl saying "Piccard was here"

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Joke

Re: Pristine bottom

Make it so!

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My GMT master stays at home when I go to the beach anyway, even though it's rated to what? 200m?. And in the 25 years I've been wearing it I've never even dived deeper than 10m. White wrist marks are annoying to say the least.

But I have travelled all timezones with it mind...

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My Tag never went below 10cm.

I don't dive. Just had it coz I though it looked cool - you live and learn. I used to like flares ..

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So, poseur then...

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I'd prefer something to be a little over-engineered than under-engineered.

Even if it's just a wrist watch.

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MJI
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I though it was a flashing David

That would be scary!!!!

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Holmes

Same as pilot's watches

I have a pilot friend who wears a £1k Breitling watch. He would argue that he needs the accuracy. I would argue that a free crystal LCD watch from a packet of 80s cereal would provide as much accuracy as a precision-engineered mechanical watch.

It's purely a fashion thing, no more than your Abercrombie & Fitch shirt or Alienware PC.

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Re: Same as pilot's watches

I'd argue that "in a modern airliner what the fuck does he need any precision watch for?"

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Re: Same as pilot's watches

Don't mechanical watches inevitably get affected by gravity anyway, thus ensuring that attempting to use one for precision timekeeping on a plane is doomed to utter and complete failure? (Even more so than the fact that, as you point out, mechanical watches are all crap at accuracy anyway?)

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Re: Same as pilot's watches

Or a watch and a pocket calculator in an Apollo Spacecapsule :)

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Anonymous Coward

Disappointed

I was hoping for a revelation about SamCam helping to raise party funds.

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Trollface

Re: Disappointed

It'd raise a lot more than just funds!

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Well, you know, my speedo goes to 150mph, the car can only go about 115mph, and the limit is 70mph.

Aye, it probably is a pose, do any of us need more than a Casio rated to about 20m - okay, Lewis is a special case, but, sometimes, if you've got it, flaunt it.

Just don't say you need it.

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Silver badge

Something that I didn't know about waterproof watches until recently is that a lot of them are assembled under pressure...then when normal atmospheric pressure is resumed, the internal pressure inside the watch pushes everything outwards; thus keeping the seal sealed.

Took me years to find out why my 200M G-shock crapped out in the shower after getting the battery changed; and that's why. Just thought you might find that of interest.

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You're dead right there...

Did a temp job years ago changing Dunhill batteries.

Once we'd got the back off (special tool), changed that battery and put the back on again we'd then plug a compressed air cylinder into a valve on the watch case and give it a blast of air while dunking the watch in a bath of fluid.

If there were no bubbles it was good to go.

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Waterproof watches

I've not done much sub-aqua at all as after seeing what's down there its pretty boring and its a tremendous anticlimax compared to what one sees on television. As to the watches that have depth ratings, take it all with a large grain of salt. Hydrodynamic forces can come into play if one goes water-skiing.

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Facepalm

Re: Waterproof watches

The hydrostatic pressure quoted is useful if you put a watch through the weekly wash.

Especially if it is rated to 50m.

Ask me why...

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Re: @davey

You haven't dived mate - 10-20% of my dives have been better than any TV.

From finding a ghost pipe fish after 15 mins of staring to getting a perfect photo of a mantis shrimp. Unbelievable.

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