A Stronghold Door is a type of door that appears in the various Stronghold Voids in Metroid Prime Hunters. They are very much like normal doors, and can be opened with any weapon. When shot, it will flash once, before fading dull, and opening when Samus approaches it. They also appear once in the Oubliette.
"This door is synchronized with STRONGHOLD PORTAL security protocols. Status: minimal shielding.