sheiny

When you beat the Parasite Queen, it'll show you where to go - so head through that door and use your Map (Z button) to get through the following rooms:
Reactor Core, Deck Gamma Monitor Hall, Connection Elevator to Deck Beta Biotech Research Area 1, Subventilation Shafts Section A & B, Cargo Freight Lift to Deck Gamma, Main Ventilation Shaft Section A-F, Biotech Research Area 2, Connection Elevator to Deck Alpha, Air Lock, Exterior Docking Hangar and you're out!