Here is part of a transcript from this fantastic, easy to watch video.
The Titan Tragedy
https://www.youtube.com/watch?v=4dka29FSZac
“so let’s talk about life support
um the data sheet claims that it has 96
hours of life support for five people my
question is how was this tested did they
put five people in the submarine while
it was ashore sealed them in there with
17 bolts and waited even 24 hours to see
how good the air quality was after one
day much less four days was that test
ever done we don’t know there’s no
information on that there’s simply a
claim on the website that they have 96
hours of life support, where is the
atmosphere monitoring system in all
these photos?
I don’t see any air pitons
or sensors anywhere and in all the
displays that I see from their public
website no there’s no indication of
oxygen levels and other you know toxic
gas levels like CO2 carbon monoxide all
these things that could generate you
need to be aware of those levels and if
they are aware it’s just not available
on any of their uh of their photos did
they just keep pumping oxygen and into
the capsule while it was underway so
they could keep the CO2 and you know
oxygen level in a proper ratio well
there’s a lot of other gases involved
with that that you have to manage as
well”
CO2 is scrubbed automatically, but probably dependent on working electrical system for fans.