Whoever said Phendrana Drifts from Metroid Prime, I second that. Quite the contrast to exploring Magmoor Caverns as well. And I could be wrong, but one of the main memories I have of that game is going through the lab that gets all dark after you find the visor upgrade, and then you have to make your way out while getting attacked by space pirates. The part I could be wrong about is that I think it's accessed from within Phendrana. I picture it on a bridge way up high with rooms in all directions, one of them being the entrance to this lab.