There is a reason they woke up.
Why it is hard sci-fi
A long-haul colony ship on a 120-year transit to a target world has thousands of passengers in hibernation. A pod malfunctions and wakes a passenger ninety years early. The film is procedurally rigorous about the engineering envelope. Pod design, ship maintenance under partial load, the limits of a single passenger trying to rotate maintenance on a vessel sized for a crew, and the logistical impossibility of going back to sleep. The interpersonal premise is famously controversial. The engineering is honest.
Science inside it
Long-duration hibernation as a transit strategy, ship-wide automation under degraded conditions, an Avalon-class vessel with a fusion reactor and a magnetic deflector for in-flight micrometeoroid defence, and the films one big ship-scale failure cascade where a deflector strike degrades the reactor cooling loop and cascades into a shutdown.
Spoiler alert
Jim wakes Aurora deliberately, which is the films ethical fault line. The reactor failure forces them to work together to stabilise the ship. The film closes on the discovery that an empty bay has been turned into a small-scale settlement by the two of them, who chose to stay awake and use the medical bays one available cryo solution to spare the other passenger. The crew that arrives at the destination ninety years later finds a tree.