Security Gates are obstacles that appear in Torvus Lagoon in the Torvus Bog in Metroid Prime 2: Echoes. They have elaborate designs and are lowered by scanning an Interface Module behind them. As such they can only be lowered from the side the Interface Module is on.

Official data

Scans

Torvus Lagoon

"Structural analysis complete. Security Gates connected to moving bridge operation. Activate bridge to open the gates."

Security Gate (Elite Quarters Access)

"Security Gate bypass unit encased in frigidite shell. Exposure to heat could clear unit and restore function."

Frigidite (Elite Quarters Access)

"Security Gates locked down. Scan indicates partial control system damage due to exposure to frigidite."

Trooper Security Station

"Security Gate disabled. Control system offline. Gate must be destroyed to advance. Recommend use of high-yield explosives."

Processing Center Access

"Security Gate disengaged. Access granted."

In other locations

Elite Quarters Access in the Phazon Mines in Metroid Prime also features slowly separating Security Gates frozen over by Frigidite.

Trooper Security Station in the Temple Grounds calls the Mk VII Defense Gate a "Security Gate" in one of its scans.

Processing Center Access in Metroid Prime has a Security Gate disabled by an Interface Module.

Obstacles
Destructible	Boulder • Breakable Organic Block • Dark Webbing • Dynamo Unit • Luminoth Webbing • Magma-eruption port Meltable Metal • Ornamental frame • Phazon Blocker • Phazon mass • Rinka • Rock spire Steel orb • Ventilation cap
Indestructible	Air Hole • Blue magnetic strip • Fan • Flame jet • Invisible platform Jump Pad • Kzan • Pirate Alarm System • Secret Passage • Spike • Structural Debris
Mechanisms	Access ramp • Ball Clamp • Bryyo Lore Locks • Chozebo • Circuit board • Combination Lock Energy conductor unit • Golden Statues • Grapple Voltage Terminal • Gun Socket Key Code (GF) • Laser beams • Laser Barrier • Light barrier • Locking mechanism Pirate X-Ray Pad • Portal generation system • Pull Block • Pumping station • Red crystal switch Red Eye Statue • Rotating lift platforms • Runic symbol • Security lever • Security ring Sensor • Shot Target • Stalactite • Stone Statues • Storm Missile Box • Switch (Complex) • Target Ventilation fans • Volcano • Weakened Column • Wide Beam Box
Gates	Converted cargo pod gate • Echo Gate • Electric Gate • Mechanical gate • Mk VI Gate Mk VII Defense Gate • Sandgate • Security Gate • Vault • Zipline Gate
Puzzles	Containment system • Conveyor system • Echo Key Beam system • Gyroscopic system "Lava cooling machine" • Luminoth laser emitter • Luminoth sonic security system Power storage racks • Routing tower • Rubiks Puzzle • Solar lens
Transportation	Conveyor • Elevator Terminal • Grapple Point • Spider Ball Track • Zipline Cable
Atmospheric	Air of Dark Aether • Air pressure • Acid Rain • Dark vapor • Extreme cold • Extreme heat • Gravity Total darkness
See Also	Blocks • Doors • Force Field • Hatch-Blocking Enemies • Phazon