Ocean Floor Civilization

This is two questions, really.
First one: if you had a civilization scattered over the abyssal plains, with
no contact with the surface, at what point would they be likely to become
aware of the existence of another civilization developing on land / the
ocean surface? What if they also spread out over the continental shelves?

Second question: what kind of tech level could a deep-ocean civilization
maintain, assuming that they could have as much help as they needed from the
surface to get set up? You could use turbines in ocean currents to generate
electricity, and geothermal power, but could you do extensive metallurgy to
make new stuff and maintain what you've got? How about making ceramics? I'm
assuming that it's not plausible to maintain large gas-filled enclosures at
the bottom of the ocean in anything like conditions that would allow simply
copying industrial processes used on land.

-l.
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