Another commenter asked how ventilation is supposed to work -- it does say "air ventilation vents" [1], though it's extremely unclear from photos where those are or how they work, and how it's compatible with not drowning when you get dumped into the sea and they're on the bottom.

But I'm also wondering about where fresh water is coming from and where waste products go. It talks about a water storage bladder/tank, but surely that's intended for weeks max, not a year?

[1] https://survival-capsule.com/Products.html