Plants Clean Air and Water for Indoor Environments

Osmunda Regalis, Christian Fischer [CC BY-SA 3.0 (],Back in the late ‘80s, NASA was looking for ways to detoxify the air in its space stations. So it conducted a study to determine the most effective plants for filtering the air of toxic agents and converting carbon dioxide to oxygen.See more on GOOD Magazine. Or the corresponding pdf’s:

Image: Osmunda Regalis, taken from Wikimedia, Christian Fischer [CC BY-SA 3.0 (],

Nemo’s Garden Project by OCEAN REEF

Portulaca_sativa_01 © Wikimedia Commons, User: BurschikGrowing plants in the undersea station will be very difficult. But the experiment below brought the following question to my mind: If the site of the station would be the Mediterranean, which is a subtropical environment, then the main season would be the summertime. During that period many crops would not grow due to sunlight intensity and heat. The project in the video might be an alternative to use the seawater as a light filter and cooling medium. Would it be worth to investigate?

CO2 Scrubber

Amron International, CO2 ScrubberLonger stays in an underwater station require systems to filter out Carbon Dioxide (CO2) from the air that is exhaled by the aquanauts. These CO2 scrubbers generally consist of a fan that pulls air through a canister filled with Carbon Dioxide (CO2) adsorbent, such as Sodasorb or Sodalime. To get a rough idea about CO2 scrubbers and their prices visit the webpage of AMRON International.


Undersea Station: Operational Depth

© CalamarPark.comThe operational depth of the station correlates with the targeted type of users and the desired decompression schedule. Let’s start from the extreme:

50m and more (depth of Sealab III -189m, depth of Conshelf III -100m): This depth is highly complicated. The aquanauts are saturated and demand long decompression periods of several days after the dives. Therefore it is impossible to go and come back, but one dive (exposure) should last several days. The breathing mixture consists mostly of Helium which makes communication without unscramblers impossible. The handling of pure oxygen requires oxygen-clear equipment. The aquanauts have to pass a long training program. The environment is cold and dark. Depths like this might be a target for the future, but for the beginning and especially for the purpose to attract attention it is not first choice. All these obstacles occur at all depths of more than 60m. Continue reading “Undersea Station: Operational Depth”

Undersea Station Draft No. 3: Sphere

Sphere DraftUpdated 13.05.2017; For a long time we favoured the shape of a sphere mainly because there were ready structures available used as pressure resistant LPG tanks. It would have measured 12m in diameter, the lower half would be filled with sand just before lowering while the upper half would contain two floors of living space. After discussing the idea with different engineers we had to accept that a LPG tank would need so many modifications that building a new one would be even cheaper. After receiving the first cost estimations we were pretty sure that it would be impossible to find funding for a civil structure of that scale.

Continue reading “Undersea Station Draft No. 3: Sphere”

Undersea Station: Ballast

Keeping an air filled structure on the sea-floor is more difficult than expected. Especially during the lowering process major difficulties occurred on previous stations. We can calculate about one kilo of weight (negative buoyancy) per liter of air inside the station (positive buoyancy). The dimensions are huge: imagine a space of 50 m² with a height of 2m, which equals 100 tons of counterweight. At the same time it has to be considered, that these weights have to be lifted again in the end of the mission. For ecological reasons we should find a way to leave the weights on the site and to use a material that would not harm the environment.

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Project Undersea Station

station kugelThe Open source project Undersea Station started several years ago on our former platform Many people gave us very precious ideas and we are very thankful for it. But we also saw that the format of a forum was not the ideal approach since too much text accumulated and kept many of the participants away from the project. Now Mart had the idea… Continue reading “Project Undersea Station”

Pressure Experiment

© CalamarPark.comThe pressure difference in passenger planes is easily understandable if you take a soft and empty plastic bottle, close it at the highest position of your flight (in the upper part of the image) and watch again while landing. You will see that the pressure makes the bottle shrink (in the lower part of the image). Continue reading “Pressure Experiment”