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The astronauts would get nitrogen narcosis even worse than in 40 m deep water breathing air. In both cases the gas pressure is 5 bar, but under water the partial pressure of nitrogen is 3.95 bar but in the spaceship 4.79 bar. This is equivalent to about 50 m deep water breathing air. See Wikipedia for signs and symptoms of the narcosis. These symptoms would endanger the life of a diver or astronaut.

But the spaceship would get too heavy anyway when built for 5 instead of 1 bar.

To avoid decompression sickness during an EVA, a partial pressure of nitrogen of 4.79 bar can't be used. A space suit pressurized to 5 bar is totally useless, so pure oxygen with about 0.3 to 0.4 bar is used to keep the suit flexible. A very long decompression procedure would be needed to avoid decompression sickness during transfer from 5 bar to only 0.4 bar.

So to avoid all these problems, high pressure swimming is impossible.

The astronauts would get nitrogen narcosis even worse than in 40 m deep water breathing air. In both cases the gas pressure is 5 bar, but under water the partial pressure of nitrogen is 3.95 bar but in the spaceship 4.79 bar. This is equivalent to about 50 m deep water breathing air. See Wikipedia for signs and symptoms of the narcosis. These symptoms would endanger the life of a diver or astronaut.

But the spaceship would get too heavy anyway when built for 5 instead of 1 bar.

To avoid decompression sickness during an EVA, a partial pressure of nitrogen of 4.79 bar can't be used. A space suit pressurized to 5 bar is totally useless, so pure oxygen with about 0.3 to 0.4 bar is used to keep the suit flexible. A very long decompression procedure (several days) would be needed to avoid decompression sickness during transfer from 5 bar to only 0.4 bar.

So to avoid all these problems, high pressure swimming is impossible.

The astronauts would get nitrogen narcosis even worse than in 40 m deep water breathing air. In both cases the gas pressure is 5 bar, but under water the partial pressure of nitrogen is 3.95 bar but in the spaceship 4.79 bar. This equivalent to about 50 m deep water breathing air.

But the spaceship would get too heavy anyway.

To avoid decompression sickness during an EVA, a partial pressure of nitrogen of 4.79 bar can't be used. A space suit pressurized to 5 bar is totally useless, so pure oxygen with about 0.3 to 0.4 bar is used to keep the suit flexible. A very long decompression procedure would be needed to avoid decompression sickness during transfer from 5 bar to only 0.4 bar.

So to avoid all these problems, high pressure swimming is impossible.

The astronauts would get nitrogen narcosis even worse than in 40 m deep water breathing air. In both cases the gas pressure is 5 bar, but under water the partial pressure of nitrogen is 3.95 bar but in the spaceship 4.79 bar. This is equivalent to about 50 m deep water breathing air. See Wikipedia for signs and symptoms of the narcosis. These symptoms would endanger the life of a diver or astronaut.

But the spaceship would get too heavy anyway when built for 5 instead of 1 bar.

To avoid decompression sickness during an EVA, a partial pressure of nitrogen of 4.79 bar can't be used. A space suit pressurized to 5 bar is totally useless, so pure oxygen with about 0.3 to 0.4 bar is used to keep the suit flexible. A very long decompression procedure would be needed to avoid decompression sickness during transfer from 5 bar to only 0.4 bar.

So to avoid all these problems, high pressure swimming is impossible.

The astronauts would get nitrogen narcosis even worse than in 40 m deep water breathing air. In both cases the gas pressure is 5 bar, but under water the partial pressure of nitrogen is 3.95 bar but in the spaceship 4.79 bar. This equivalent to about 50 m deep water breathing air.

But the spaceship would get too heavy anyway.

To avoid decompression sickness during an EVA, a partial pressure of nitrogen of 4.79 bar can't be used. A space suit pressurized to 5 bar is totally useless, so pure oxygen with about 0.3 to 0.4 bar is used to keep the suit flexible.

So to avoid all these problems, high pressure swimming is impossible.

The astronauts would get nitrogen narcosis even worse than in 40 m deep water breathing air. In both cases the gas pressure is 5 bar, but under water the partial pressure of nitrogen is 3.95 bar but in the spaceship 4.79 bar. This equivalent to about 50 m deep water breathing air.

But the spaceship would get too heavy anyway.

To avoid decompression sickness during an EVA, a partial pressure of nitrogen of 4.79 bar can't be used. A space suit pressurized to 5 bar is totally useless, so pure oxygen with about 0.3 to 0.4 bar is used to keep the suit flexible. A very long decompression procedure would be needed to avoid decompression sickness during transfer from 5 bar to only 0.4 bar.

So to avoid all these problems, high pressure swimming is impossible.