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I have looked at a few do it yourself remotely operated vehicles (ROV), and considered making one myself. However my research on the web has turned up a lot of conflicting information about determining what the temperature and pressure ranges to expect at various depths.

I would like to be able to build something that can go to 4000 meters or even 6000 meters depth. My interest is chiefly in being able to carry illumination and cameras.

Can someone direct me to validated resources of temp pressure and perhaps even pH conditions. Has anyone ever heard of using fused silica cylinders to hold camera/lighting/battery packs for an ocean going ROV?

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    $\begingroup$ What reasonable resource gives conflicting info about T and P at depth. These are fairly straight forward with small uncertainty at the extreme depths you want. $\endgroup$ – mankoff May 18 '15 at 18:30
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    $\begingroup$ You can't do 4000 or 6000 m as DIY, unless you have a large budget and manufacturing facilities. $\endgroup$ – mankoff May 18 '15 at 18:31
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For pressure, you can use something simple like the fact that pressure increases by around 1 atm with each 10 m of water depth. You can also use some very simple calculators that assume a constant density (not a bad assumption) and gives you the different unit conversion.

For temperature, it varies a fair amount depending on where in the ocean. The average vertical profile for mid-latitudes, looks something like:

http://www.windows2universe.org/earth/Water/temp.html (Windows to the Universe).

If you need more detail temperature information for a specific location, you can look into the World Ocean Atlas, which provides observed temperature, salinity (and in some cases other parameters like ph) for the entire world.

My suggestion is that, if you need any specific information, you might ask the people at the Woods Hole Oceanographic Institution (for instance) that deal with this kind of problem on a regular basis.

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