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?