Apparently subsea HVDC cables are actually buried around 2m below the sea bed using some kind of plough-like device. How can that be done without cutting internet cables?
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$\begingroup$ Source for that? I suspect that most cables are buried only in the shallows (< 30 m?) on the approach to shore. $\endgroup$– TransistorCommented May 21, 2022 at 20:24
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$\begingroup$ if you could do that 2000 m below the surface across all terrain, avoiding other cables would be child's play. $\endgroup$– Tiger GuyCommented May 21, 2022 at 20:58
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$\begingroup$ Check out the pipe burying equpment used by farmers - same principle. $\endgroup$– Solar MikeCommented May 21, 2022 at 21:15
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3$\begingroup$ San Francisco to Pittsburg .... yeah definitely subsea all the way. $\endgroup$– Carl WitthoftCommented May 23, 2022 at 14:06
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2$\begingroup$ @CarlWitthoft - It's actually Pittsburg, California. The route is entirely underwater, but entirely within San Fransisco Bay and its associated waters - certainly not very deep. $\endgroup$– MarkCommented May 24, 2022 at 2:59
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It seems like they are not buried in deep water so I guess the carefully arrange crossings to only occur there.
From this document, page 41:
The cables are buried in the seabed sediment up to depths of 400-600 m, below this depth they are simply laid down on the bottom of the sea. In places with strong sea currents or steep slopes they are fastened to the seabed.