[thaumasiotes]

> There is no point in burying a cable if the sea bed is 3 miles under the surface.

There is a point, it's just not something we're able to do. You can get the cable onto the sea bed by lowering it from the surface. We know how to get to the surface.

To bury it, you'd need to run a digging operation at the bottom of the ocean.

[emiliobumachar]

...which we're able to do, we do somewhat similar digs for offshore oil all the time, but it's not worth the gargantuan expense. The risk of leaving it exposed is worth it.