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Cis-Lunar was a company specializing in the production of automatic, computer-controlled closed-circuit re-breathers.


Originally, Cis-Lunar aimed to develop spacesuit kits, but the dot-com crash in the early 2000s hindered their ability to finance the mass production of the MK5 re-breather, which featured designs intended to reduce system and mission failures.[1]

In 2005, the Swedish diving equipment manufacturer Poseidon acquired Cis-Lunar's technology. Bill Stone, founder of Stone Aerospace, was appointed to lead a team in designing a new closed-circuit re-breather under Poseidon.[2][3]

Bill Stone of Cis-Lunar and Richard Pyle discussed the Mark VI's design principles and operation in an interview with Scuba Magazine.[4]


The word cis-lunar comes from Latin and means "on this side of the Moon" or "not beyond the Moon".[5]

See also[edit]


  1. ^ Stone, WC (1987). "Design of fully redundant autonomous life support systems". In: Mitchell, CT (eds.) Diving for Science 86. Proceedings of the American Academy of Underwater Sciences Sixth Annual Scientific Diving Symposium. Held October 31 - November 3, 1986 in Tallahassee, Florida, USA. American Academy of Underwater Sciences. Archived from the original on July 27, 2011. Retrieved 2011-03-12.{{cite journal}}: CS1 maint: unfit URL (link)
  2. ^ "Poseidon MKVI". Poseidon. Archived from the original on 2012-03-04. Retrieved 2012-03-29.
  3. ^ "Stone Aerospace - History". Stone Aerospace/PSC, Inc. Archived from the original on 2013-01-05. Retrieved 2009-03-23.
  4. ^ "HD Interview with Bill Stone of Cis-Lunar Demonstrating Mark 6 & Powering Up Displays". Retrieved 2009-03-23. (may require registration)
  5. ^ "Johns Hopkins APL Engages Government and Industry on Critical Lunar Space Issues | Johns Hopkins University Applied Physics Laboratory". Retrieved 2023-11-22.

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