http://www.wisegeek.com/what-types-of-space-colonies-have-been-proposed.htm
In 1929, Dr. John
Desmond Bernal conceived of the Bernal sphere, a rotating space colony with a diameter of approximately 15 kilometers (9.3 miles), filled with air and colonized around the equator, where the rotation of the colony would create centrifugal force to simulate Earth's gravity.
In the 60s and 70s, speculation and research into the possibility of space colonies experienced a renaissance, brought on by the Space Race. One of the most prominent thinkers participating in the design and advocacy of space colonies was Princeton physicist Gerard O'Neill, who in 1969 asked the provocative question, "Is the surface of a planet really the right place for an expanding technological civilization?" Throughout the 70s, O'Neill led workshops that investigated several proposed space colony designs in great detail.
A NASA Summer Study in 1975 investigated three primary designs, dubbed Island One, Island Two, and Island Three. All three are based on the premise of a self-sustaining, artificial ecology within the station, called an arcology.
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I found something else about "Bernal Sphere" :
"A Bernal sphere is a type of space habitat intended as a long-term home for permanent residents, first proposed in 1929 by Dr. John Desmond Bernal.
Dr. Bernal's original proposal described a hollow spherical shell 16 km in diameter, with a target population of 20,000 to 30,000 people. The Bernal sphere would be filled with air.
In a series of studies held at Stanford University in 1975 and 1976 with the purpose of speculating on designs for future space colonies, Dr. Gerard Kitchen O'Neill proposed a modified Bernal sphere with a diameter of only 500 m rotating at 1.9 RPM to produce a full Earth gravity at the sphere's equator. The result would be an interior landscape that would resemble a large valley running all the way around the equator of the sphere. Sunlight was to be provided to the interior of the sphere using external mirrors to direct it in through large windows near the poles. The form of a sphere was chosen for its optimum ability to contain air pressure and its optimum mass-efficiency at providing radiation shielding.
This version of the Bernal sphere was dubbed the "Island One" design, and was sized for a population of 10,000. For comparison, Island Two would house 140,000, and Island Three (O'Neill cylinder) would support a population of 10,000,000. "
http://encyclopedie-en.snyke.com/articles/bernal_sphere.html
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Pictures of a Bernal sphere
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Pictures of John Desmond Bernal , which looks ALOT like Desmond that was living below the hatch
