Today, my research led me to discover that the argon-oxygen mixture I was considering would not work for my purposes, that a neon-oxygen mixture would work better. This surprised me, but argon actually can cause a more severe decompression sickness than nitrogen! Hard to believe!
With multiple layers of moon pools and caisson locks for naval navigation well below sea level, it's important that the high-pressure gas used to push back the seawater be breathable, and the pressure changes be tolerable for humans. Argon is not a suitable gas for this. Rather, a breathing gas that is mostly neon, with just enough partial pressure of oxygen to keep the blood red, is more suitable.
To obtain neon, you must cryogenically liquify atmospheric air, and then use fractional distillation to separate the neon out. Neon is expensive for this reason: there is only so much of it. Liquifaction and fractional distillation of air is the only source of neon.
The multiple layers of moon pools and ship locks means that you can have navigable canals well below sea level and control the flow of seawater from the sea into subterranean tunnels. This seawater can be used for multiple things, including subterranean mariculture and saline aquaponics. It can also be used for desalinating into potable water, which can also be used for subterranean freshwater aquaponics.
If we want to construct a subterranean and submarine habitat, food and water production in a sustainable fashion is important. Fish is a wonderful source of food. Many animals, such as goats and chickens, can also be grown in a neox breathing environment. For growing plants, a carbon dioxide obtained from the animals and filtered out of the breathing neox gas can be given to the plants in a neon-carbon dioxide gas. Most crop plants should grow just fine this way. Whatever stuntedness the crop plants suffer because of the ultra-high pressure may be countered with careful aquaculture nutrient balancing.
One nice thing about the neon-oxygen gas is it can be stored fairly safely in liquid form separately, and that the balance of oxygen to neon can be tweaked in case of fire. Fires in submarine and subterranean habitats is an especially deadly threat, because oxygen can be consumed very quickly if not carefully managed. When a fire breaks out, carefully re-balancing the partial pressure of oxygen to provide enough for humans to survive during an incident while starving the fire outbreak is a necessary firefighting measure.
With multiple layers of moon pools and caisson locks for naval navigation well below sea level, it's important that the high-pressure gas used to push back the seawater be breathable, and the pressure changes be tolerable for humans. Argon is not a suitable gas for this. Rather, a breathing gas that is mostly neon, with just enough partial pressure of oxygen to keep the blood red, is more suitable.
To obtain neon, you must cryogenically liquify atmospheric air, and then use fractional distillation to separate the neon out. Neon is expensive for this reason: there is only so much of it. Liquifaction and fractional distillation of air is the only source of neon.
The multiple layers of moon pools and ship locks means that you can have navigable canals well below sea level and control the flow of seawater from the sea into subterranean tunnels. This seawater can be used for multiple things, including subterranean mariculture and saline aquaponics. It can also be used for desalinating into potable water, which can also be used for subterranean freshwater aquaponics.
If we want to construct a subterranean and submarine habitat, food and water production in a sustainable fashion is important. Fish is a wonderful source of food. Many animals, such as goats and chickens, can also be grown in a neox breathing environment. For growing plants, a carbon dioxide obtained from the animals and filtered out of the breathing neox gas can be given to the plants in a neon-carbon dioxide gas. Most crop plants should grow just fine this way. Whatever stuntedness the crop plants suffer because of the ultra-high pressure may be countered with careful aquaculture nutrient balancing.
One nice thing about the neon-oxygen gas is it can be stored fairly safely in liquid form separately, and that the balance of oxygen to neon can be tweaked in case of fire. Fires in submarine and subterranean habitats is an especially deadly threat, because oxygen can be consumed very quickly if not carefully managed. When a fire breaks out, carefully re-balancing the partial pressure of oxygen to provide enough for humans to survive during an incident while starving the fire outbreak is a necessary firefighting measure.
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