Sonic Visor

The sonic visor is the item Samus recieved in Metroid Prime 2: Echoes when she defeated Dark Samus in the Sactuary Fortress. The visor allows Samus to see sonic locks keeping doors shut. When the sonic visor is used in conjuction with the anhiliator beam's missile combo, she can unlock ceartain doors such as the one in the bottom of the Main Gyro Chamber in the light Sanctuary Fortress.