How does the air inside the submarine stay fresh during the excursion?
The submarine has a sophisticated central air conditioning and life support system. Since the typical undersea excursion lasts for one hour, the air supply is enough for all the 43 people on board. The air is also dehumidified and cooled if needed by air conditioning system. There is also an instrument on board, which controls a quality of the air inside the cabin. For the safety reasons the submarine is extra equipped with the air scrubbing system – “oxygen generator”. So the carbon dioxide respired during breathing might be scrubbed if it is necessary out of the air by the special granular chemical contained in the main scrubbing system.
