The Structural Debris is an object in Metroid Prime Hunters, found in the Crash Site room on Alinos. It is thought to have been damaged by Gorea, as the room's name implies that it was the site where the behemoth crashed.
In Metroid: Other M, debris is an obstacle in the final Countdown sequence. In some of the rooms towards the Spaceport, debris will fall from the ceiling (or be there already) in flames. If Zero Suit Samus comes into contact with any, it will deal 10% damage to her. The debris was even seen covering the only Navigation Booth in the escape route, preventing its use.
Metroid Prime Hunters
Severe architectural damage. Evidence of unidentifiable interstellar matter, a result of an extraterrestrial collision.