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Chapter 2: Starship Combat / Additional Starship Options / Starship Damage and Repair / Hull Ruptures

Atmospheric Decompression

Source Starship Operations Manual pg. 50
The first effects of a ruptured hull are dropping room pressure and massive winds that buffet the characters. All characters in a room with a ruptured hull, regardless of whether they have personal environmental protections, immediately take 3d6 bludgeoning damage as the air in the room pours into the void of space. Next, each creature must prevent itself from being swept out into space. They must attempt a DC 15 Reflex save to either engage the magnetic locks on their armor’s boots or grab on to a bolted piece of furniture. Jump jets, jet packs, flight, or anything else that enables characters to maneuver in zero gravity provide a +1 circumstance bonus to this save.
The dropping room pressure causes immediate exposure to the environmental hazards of being in a vacuum (Starfinder Core Rulebook 394). Characters with armor, void adaptation, or any other ability that enables them to survive in a vacuum are unaffected. Instances of crew being trapped unarmored during a hull breach are relatively rare. Proximity alarms warn of incoming ships, asteroids, and other environmental hazards, so most crew get the opportunity to engage armor seals long before hull ruptures happen.
A bigger problem for some characters is dealing with their ship’s safety protocols that trap them in harm’s way. Automated systems on many starships immediately seal off rooms that have a hull breach in order to protect the environment of the rest of the ship. Seals can usually be overridden with a successful DC 10 Computers or Engineering check at the doors or from the bridge, but this often requires first sealing off rooms deeper within the ship to create a makeshift airlock into which the trapped crew members can escape.