Transport to Phazon Mines West
Workstation Tunnel is a room located in the Magmoor Caverns region of Metroid Prime. It contains a pile of rubble that blocks access to the opposite end of the room, which requires a Power Bomb to break. The Zoomers in this room give a guaranteed PB drop.
Get the Guaranteed PB Drop from Behind
It is possible to shoot through the rubble in order to kill the Zoomer, allowing you to use the Charge Beam and pick up the drop from there. This can be done on any version of the game.