Kanske Hyperion av Dan Simmons?
Det har varit några decennier sedan jag läste det och jag kommer inte ihåg några airlocks, men det finns en (tvärformad) parasit som kallas en korsform som gör värden odödlig.
After many weeks, Duré steals into their sacred cavern and discovers a finely wrought cross-shaped artwork that predates human spaceflight by millennia. He deduces that they are survivors from a seedship crash centuries earlier who have been infected with cross-shaped organisms called cruciforms that integrate themselves into their host. After death, the cruciform rebuilds the physical body and resurrects them. The price of immortality is that resurrection information is lost, and over time they become unintelligent and androgynous, losing all distinguishing features. When he is seen topless while bathing the Bikura discover he has no cruciform on him. Debating killing him they instead lead him into Hyperion's labyrinth system where he encounters the Shrike and is unknowingly infected with a cruciform.