A hull breach in the Zvezda module did not result in immediate total cabin air loss due to restricted flow rates
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
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AS REPORTEDno primary record reached; this is what the reporting says
Retrieved space-flight references confirm that a hole or breach in a pressurized space module like Zvezda does not cause instant total air escape, as limited hole sizes restrict flow rates and prolong depressurization over hours or days.
Crew Spending Weekend in Station’s Russian Segment - NASA
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## International Space Station
# Crew Spending Weekend in Station’s Russian Segment
The Expedition 63 crew will spend the weekend in the Russian segment’s Zvezda service module during a cabin air leak test.
The three Expedition 63 crew members living aboard the International Space Station will spend the weekend inside the orbiting lab’s Russian segment. Commander Chris Cassidy and his crewmates Ivan Vagner and Anatoly Ivanishin will stay in the Zvezda service module from Friday night into Monday morning.
The station’s atmosphere is maintained at pressure comfortable for the crew members, and a tiny bit of that air leaks over time, requiring routine repressurization from nitrogen tanks delivered on cargo resupply missions. In September 2019, NASA and its international partners first saw indications of a slight increase above the standard cabin air leak rate. Because of routine station operations like spacewalks and spacecraft arrivals and departures, it took time to gather enough data to characterize those measurements. That rate has slightly increased, so the teams are working a plan to is
# If there's a hole in Zvezda module, why didn't all the air onboard immediately escape into space?
Tags: iss, pressure, zvezda, leak
- Score: 10
- Views: 4061
- Answers: 3
- Answered: yes
- Asked by: Greenhorn (363 rep)
- Asked: 2020-12-20
- Edited: 2020-12-20
- Site: space
## Question
The ISS is leaking through a hole in the Zvezda module that still hasn't been found.
However, as with all pressurized chambers, shouldn't all air instantly run out through the hole into the vacuum of space immediately after the hole formed, forcing the astronauts to put on spacesuits?
Or is it rather a valve that's leaking like in case of Soyuz 11 (where however all the air also run out quite quickly, killing the crew)?
## Answers
### Answer by Innovine (score: 29 [ACCEPTED])
It would take around 7 hours to depressurize the ISS through a bullet hole. See http://www.spaceacademy.net.au/flight/emg/spcdp.htm
Smaller holes will take longer. A tiny crack might take days to even cause a noticeable pressure drop. The ISS is not 100% leak-proof, so some small amount of air needs to be added on a regular basis to top it up. Further, the ISS spends roughly half of its time on the day side, and half on
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