Samus facing a level 4 security door.
Red Hatches (Security Level 4) can be found throughout the Biologic Space Laboratories research station in Metroid Fusion. To open them, Samus must find the Level 4 Security Station located at the bottom-left corner of Sector 4. Once Samus has unlocked the doors, she can freely pass through them like normal doors by shooting them.
Even though the Red Hatches are Samus' only way out of the lower area of Sector 4 (unless she resorts to Sequence Breaking), Adam gets upset at her for unlocking them without his permission. Of course, this is likely because the Restricted Laboratory for the Federation's secret Metroid breeding program lies behind a series of Red Hatches.
Trivia
- Although they are the last hatches available to be opened, they are the first hatches encountered in the game.