Deep thoughts and some questions

The other day i was watching some documentary on something or other about deep ocean stuff. They show the obligatory shot of the ROV touch down and silt plumes up around the machine.


We've all seen it.


So pressure vs density?

Here is an excerpt from the wiki page on the Marinas trench.

At the bottom of the trench, the water column above exerts a pressure of 1,086 bars (15,750 psi), more than 1,071 times the standard atmospheric pressure at sea level. At this pressure, the density of water is increased by 4.96%.

[FONT=-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Lato, Helvetica, Arial, sans-serif]Those of us that have hydro locked an engine know water dosnt really compress much.
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[FONT=-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Lato, Helvetica, Arial, sans-serif]My question is this.

Shouldn't that silt have almost 16,000 pounds holding it down? Id think the ocean floor would be like a steel plate and everything smashed flat?

I know the pressure surrounds objects evenly and thats why we use spheres to get there but at some point there is no more "underneath" and the weight (pressure) should be pushing down?


Right now im watching a doc titled, "The Deadly Treasure of Lake Kivu."
It talks about this deep lake in africa that is holding ton and tons of methane under its water due to water density.


For some reason I can not wrap my brain around this.


Do ROVs use more power to cover a given distance at great depth due to water density?

Much like an aircraft burns more fuel the higher it flys due to reduced air density / lift.


Any one here a deep water scientist type?


Or just can explain in simple terms what I am not taking into account?


Thank you, next window please.





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