Extreme cold

Extreme cold, is an obstacle faced in Metroid Fusion''. ''Due to Samus having been injected with Metroid DNA at the beginning of the game, sub zero temperatures become a threat to her until she recovers the Varia Suit.

This threat can be seen given be the Ice Beam when shot be the SA-X, which can freeze Samus and deal 200 units of damage. It is posed as a direct Hazard to Samus in the Sub-Zero Containment Unit and in Sector 5, as the environment itself is cold enough to damage Samus constantly, more so in Sector 5. In the Sub-Zero Containment Unit, the cold damages Samus at a rate of 2 units of energy per second, while in Sector 5, it damages her at a rate of 15 units per second, and knocks her backwards every 1.25 seconds. It is also made apparent in the Cold X in Sector 5 and Sector 6, which will pursue Samus, as they know that they are a very large threat to her. Once Samus recovers the Varia Suit, most of these effects become negligible, except for the Ice Beam, which will still deal massive amounts of damage to Samus.

Trivia

 * Despite being a very large threat to Samus until she gets the Varia Suit, the only cold environment on the beaten path is the Sub-Zero Containment Unit, as Samus is never required to enter Sector 5 until she gets the Varia Suit.
 * The knockback effect seen in Sector 5 was likely implemented to disallow Samus from using the Speed Booster to break some Boost Blocks required to be able to access the Security Room in the sector, which would be a Sequence Break.