They uses ROV(remotely operated vehicles) and uses high tech
ultra-sound machines to find it, similar to those used to
check/inspect metal welds, or maybe they use sonar, powerful enough
to penetrate the seabed.By using ultra-sound for example, sound
waves travels thru the seabed and if it hits an object, the sound
wave is reflected and an image is formed, as seen by different
clolours and shape.For example, the seabed will be represented by
orange or brown and red colour, whereas the cables detected will be
coloured as blue or green. Or maybe they use those offshore oil and
gas technologies used to pin point the exact location of the gas
and oil pockets. ROVs were used to bring up the cables and also
help the divers manage the cables that's out of reach from humans.
