Channeled by Frank Alper in Exploring Atlantis.

Frank doesn't say but I believe they are 4d people. 

Approximately four miles from the exact north of
this planet is a tunnel that descends to the bowels of
the Earth. At this location your atmosphere is cleaner
and, if one were to stand on this point, he would truly
feel encompassed by the vibrations of the Father. It is
an area that is untouched and un-trampled by mankind
and still quite pure in vibrations.
A civilization exists at the bottom of this tunnel. A
civilization of physical beings bearing little resemblance
to yourselves, it has existed there for millions of your
years. Perhaps we should allocate a name to this
civilization for later identification. One would spell the
name URAMORAN. This name denotes the basic
vibrations of those incarnated there and describes their
function. Those of you who wish to find a correlation
within numerology to help you understand the
vibrations of these beings may dissect this name.
This civilization was and is far more advanced than
those of Atlantis. Those incarnating there are indeed
Elders of this and other universes. You might call them
forerunners of modern civilizations. Although they
possess physical form, they do not ingest food such as
you do. They survive and are regenerated through
energy. I believe you refer to it as “manna.” The
Hebrews survived on this through their sojourn across
the desert but man could not relate to this and so
inscribed in the scriptures a physical form of
sustenance, one that he could relate to.
Within the core of the planet, this civilization serves
as a message center, transferring communications from
space, vast distances away, to your brothers and sisters
in a closer proximity. They also serve those in space
who do not have sufficiently sophisticated equipment to
28 Exploring Atlantis
receive this communication themselves. They serve to
supply power and energy to other civilizations that do
exist within the core of the planet.
Whenever the Planet Earth undergoes vibrational
changes, a maturing in its development, part of these
changes originate from the energies within this
civilization.
It might be difficult for you to understand how a soul
could permit itself to exist in such a place for a million of
your years, so I remind you, of the vast difference in
correlation between Earth and spiritual time. When one is
dealing with spiritual vibrations, one does not have an
ending point to relate to. This means that there is no
comparative framework that could perhaps cause one
period to seem shorter or longer than another.
If humans would stop celebrating birthdays, some of
you would not age so fast. You set conditions for
yourselves by comparisons and limitations. You will find
that, as your enlightenment grows, your concern and
interest in those yearly celebrations will diminish. It will

come to a point where birthdays will have no meaning for
you. Your relation to those events will lessen as you grow.