They are actually placed on the ocean floor and follow the seabed. Near the shore, the cable is housed in a solid casing placed in a trench that is dug by a remotely operated vehicle.
Tos izvelk pa okeāna vai jūras dibenu, bet krasta tuvumā ievieto cietā aizsargapvalkā un iegulda tranšejās, kas izraktas ar tālvadības tehniku.