They can be seen on the Pirate Homeworld as Samus enters the planet and in the background during the fight with Gandrayda. Many of these tentacles can of course be seen on planet Phaaze, which is the source of all Phazon. A slightly different variant of these massive tentacles can be seen in the Sanctum where Samus battles both Dark Samus and Aurora Unit 313; these tentacles have a spherical, glowing stub located at their tip.