Well according to these guys.(who very impressive credentials by)
www.thehorizonproject.com... They say that only a small band of people
are usually left after the event. Oh yeah and this event has happened repeatedly.
The event you ask?
Our plant, our solar system, our universe, and possibly are galaxy travel on a cyclical plane. Well once every X amount of years we(our solar system
at a minimum) pass through something they refer to as the "Galatic Plane" this cause some massive gravitational interference that actually shakes
the planet.
When this happens it causes as you can imagine, massive title waves, earth quakes, eruptions, etc
The world is changed almost instantainously.
You may ask then where is the technology, where are the cities? They claim there is evidence all around us. This is a ancient battery
images.google.com...://www.world-mysteries.com/bat1a.jpg&imgrefurl=http://www.world-mysteries.com/sar_11.htm&h=188&w=153&sz=4&h
l=en&sig2=5LRLJMME33vyUZx27_u4tQ&start=3&tbnid=h9oa7Oq2MU5FzM:&tbnh=102&tbnw=83&ei=KdfpRcPpIqGqiwHRmdWbBQ&prev=/images%3Fq%3Dancient%2Bbattery%26svnum
%3D10%26hl%3Den%26sa%3DN
This is a ancient gyroscope with gears(dated well before we as humans thought we knew about gears)
images.google.com...://www.world-mysteries.com/bat1a.jpg&imgrefurl=http://www.world-mysteries.com/sar_11.htm&h=188&w=153&sz=4&h
l=en&sig2=5LRLJMME33vyUZx27_u4tQ&start=3&tbnid=h9oa7Oq2MU5FzM:&tbnh=102&tbnw=83&ei=KdfpRcPpIqGqiwHRmdWbBQ&prev=/images%3Fq%3Dancient%2Bbattery%26svnum
%3D10%26hl%3Den%26sa%3DN
The cities, well some are underground, some are buried deep in the ocean
images.google.com...://s8int.com/images2/dwaraka.jpg&imgrefurl=http://s8int.com/water25.html&h=438&w=300&sz=49&hl=en&sig2=leUhS
CCsGdZ86eCvM5rw_A&start=6&tbnid=hgAVNSlfFXCsGM:&tbnh=127&tbnw=87&ei=utfpRZWzLZTKiwGQyaWuBQ&prev=/images%3Fq%3Dunderwater%2Bcities%26svnum%3D10%26hl%3D
en%26sa%3DN
and
images.google.com...://www.edgarcayce.org/am/Resources/muinjapan.jpeg&imgrefurl=http://www.edgarcayce.org/am/underwatercities.h
tml&h=218&w=400&sz=14&hl=en&sig2=bu8tgT2nBBFTzRgZzxwThA&start=1&tbnid=ORD-kuk1Q9JuZM:&tbnh=68&tbnw=124&ei=49fpRYPZM4GMiQGHkrzhBA&prev=/images%3Fq%3Dun
derwater%2Bcities%2BJapan%26svnum%3D10%26hl%3DenM
There is tons more information.
What other evidence do they have, the polar ices layers show signs of space dust every 10000 years or so that normally would not penetrate the
atmosphere unless there was not an atmosphere(cataclysmic event). If there is no atmosphere then the dust can be deposited on the planet