A flooded moon has rising water, cutting off critical areas and making it increasingly impossible to traverse the lowlands and eventually most of the landing area. Crews should return to their autopilot ship sooner and also keep safe routes back to the ship in mind.

Wading through flooded terrain slows crew mates down considerably, draining their stamina and making them unable to run. They can regenerate stamina by standing still. Crew mates will drown if they're fully underwater for enough time.

Flooding starts low and gets progressively worse as time goes on. Maximum flooding tends to be around 5:00 PM, but it may vary across moons, and building entrances can become inundated earlier than that (Rend and Titan cannot be flooded).

Strategy: Stick to routes that are elevated above the ground, and if the whole moon is submerged, just be careful to avoid staying under too long.