Blue Hatches (Security Level 1) can be found throughout the Biologic Space Laboratories research station in Metroid Fusion. They are mostly in Sector 2 and are the blue colored doors. To open them, Samus must find the Level 1 Security Station, located in the top right corner of Sector 2. Once Samus has unlocked the doors, she can freely pass through them like normal doors by shooting them.

Doors
All
Blue Door
Metroid Prime
Red Door • Purple Door • White Door
Metroid Prime 2: Echoes
White hatch • Purple hatch • Gray hatch
Metroid Prime 3: Corruption
Green Door • Orange Door
Metroid Fusion
Grey Hatch • Blue Hatch • Green Hatch • Yellow Hatch • Red Hatch
Blast Shields
M/MZM, MP, MP2, MP3, MII, SM
Red Blast Shield • Green Hatch • Yellow Hatch • White Blast Shield • Multi-Lock Blast Shield • Mounted Blast Shield
Metroid Prime Hunters
Red Blast Shield • Green Blast Shield • Yellow Blast Shield • Purple Blast Shield • Orange Blast Shield • Brown Blast Shield Force Fields: Green • Yellow • Purple • Orange • Blue
Miscellaneous Doors
De-energized Door • Echo Gate • Leviathan Door • Light barrier • Metal Door • Phaaze Door • Sealed Door • Shutter • Special Hatch • Stronghold Door • Translator Door • Telekinetic barrier • Vault Door • Waste Disposal Unit
Hatch-Blocking Enemies
Gadora • Geron • Ing Webtrap • Webling • ULF 14 • ULF 36