Mobius Journey

The President of the United States said "There has been secret meetings of the world's leaders to discuss what can be done. All of them came to the same conclusion: That there has to be a most unusual and extreme action taken if man is to be saved for the continuation of the human race.
"The reason you are here is to design a structure to be built in space to house an initial complement of 50,000 people with enough room for growth to contain 1 million. This structure is also to be maneuverable so as to travel interstellar distances for exploration in hopes of finding another suitable planet for man to live. This has an expected completion time within the 500 years predicted of the collapse of civilization. No other project in the history of this planet has been as important as this."
Mobius Journey, the most incredible undertaking of mankinds survival and greatest journey ever, over a period of 800,000 years begins from the start of the greatest ice age in the history of the planet tells the story of the hundred mile diameter spaceship CINTHEA of its journey to the edge of the Oort cloud. The 50,000 people on board grows to over a population of 700,000 that lives in relative peace and harmony. Approaching the Oort cloud a hard decision has to be made about their next action that could either transport them to their future home or destroy the ship and everybody on board.