Where is the Missile Expansion in Quarantine Monitor (Metroid Prime Origins)?

The Missile Expansion is in Quarantine Monitor, Phendrana Drifts. To get there you need Missile Expansion, Space Jump, Morph Ball, Morph Ball Bomb, Varia Suit, Charge Beam, Wave Beam, Boost Ball, Super Missile, Power Bomb Expansion, Spider Ball, Ice Beam, Grapple Beam first (starting a new game).

What you need first

Starting a new game from Landing Site, get these first, in this order, then go to Quarantine Monitor (174 rooms in all):

1. Missile Expansion in Landing Site (0 rooms; needed for Missile Expansion (Missile))
2. Space Jump in Alcove (1 room; needed for Missile Expansion (Space Jump Boots))
3. Morph Ball in Ruined Shrine (10 rooms; needed for Missile Expansion (Morph Ball))
4. Morph Ball Bomb in Burn Dome (13 rooms; needed for Varia Suit (Morph Ball Bomb))
5. Varia Suit in Sunchamber (10 rooms; needed for Missile Expansion (Varia Suit))
6. Charge Beam in Watery Hall (7 rooms; needed for Missile Expansion (Charge Beam))
7. Wave Beam in Chapel of the Elders (27 rooms; needed for Missile Expansion (Wave Beam))
8. Boost Ball in Phendrana Canyon (8 rooms; needed for Missile Expansion (Boost Ball))
9. Super Missile in Observatory (10 rooms; needed for Missile Expansion (Super Missile))
10. Power Bomb Expansion in Ice Ruins West (8 rooms; needed for Grapple Beam (Power Bomb))
11. Spider Ball in Quarantine Cave (5 rooms; needed for Grapple Beam (Spider Ball))
12. Ice Beam in Antechamber (39 rooms; needed for Grapple Beam (Ice Beam))
13. Grapple Beam in Storage Depot B (18 rooms; needed for Missile Expansion (Grapple Beam))

Last stretch

From Storage Depot B, door by door:

1. Storage Depot B: go through the door to Ore Processing → Ore Processing (Ice Door; needs Ice Beam)
2. Ore Processing: go through the door to Elevator Access A → Elevator Access A (Ice Door; needs Ice Beam)
3. Elevator Access A: go through the door to Elevator A → Elevator A (Ice Door; needs Ice Beam)
4. Elevator A: go through the door to Elite Control Access → Elite Control Access (Ice Door; needs Ice Beam)
5. Elite Control Access: go through the door to Elite Control → Elite Control (Wave Door; needs Wave Beam)
6. Elite Control: go through the door to Maintenance Tunnel → Maintenance Tunnel (Ice Door; needs Ice Beam)
7. Maintenance Tunnel: go through the door to Phazon Processing Center → Phazon Processing Center (Ice Door; needs Ice Beam)
8. Phazon Processing Center: go through the door to Transport Access → Transport Access (Ice Door; needs Ice Beam)
9. Transport Access: go through the door to Transport to Magmoor Caverns South → Transport to Magmoor Caverns South (Ice Door; needs Ice Beam)
10. Transport to Magmoor Caverns South: take the elevator → Transport to Phazon Mines West assumed
11. Transport to Phazon Mines West: go through the door to Workstation Tunnel → Workstation Tunnel (Ice Door; needs Ice Beam)
12. Workstation Tunnel: go through the door to Magmoor Workstation → Magmoor Workstation
13. Magmoor Workstation: go through the door to Transport Tunnel C → Transport Tunnel C (Wave Door; needs Wave Beam)
14. Transport Tunnel C: go through the door to Transport to Phendrana Drifts South → Transport to Phendrana Drifts South (Wave Door; needs Wave Beam)
15. Transport to Phendrana Drifts South: take the elevator → Transport to Magmoor Caverns South assumed
16. Transport to Magmoor Caverns South: go through the door to South Quarantine Tunnel → South Quarantine Tunnel (Wave Door; needs Wave Beam)
17. South Quarantine Tunnel: go through the door to Quarantine Cave → Quarantine Cave (Wave Door; needs Wave Beam)
18. Quarantine Cave: go through Morph Ball Door to Quarantine Monitor → Quarantine Monitor (Morph Ball Door; needs Morph Ball)

More Missile Expansions

• Missile Expansion (Burn Dome)
• Missile Expansion (Crossway)
• Missile Expansion (Dynamo)
• Missile Expansion (Dynamo)
• Missile Expansion (Furnace)
• Missile Expansion (Gathering Hall)
• Missile Expansion (Hive Totem)
• Missile Expansion (Main Plaza)
• Missile Expansion (Main Plaza)
• Missile Expansion (Main Plaza)
• Missile Expansion (Ruined Fountain)
• Missile Expansion (Ruined Gallery)
• Missile Expansion (Ruined Gallery)
• Missile Expansion (Ruined Nursery)
• Missile Expansion (Ruined Shrine)
• Missile Expansion (Ruined Shrine)
• Missile Expansion (Training Chamber Access)
• Missile Expansion (Vault)
• Missile Expansion (Watery Hall)
• Missile Expansion (Watery Hall Access)
• Missile Expansion (Fiery Shores)
• Missile Expansion (Storage Cavern)
• Missile Expansion (Triclops Pit)
• Missile Expansion (Elite Control Access)
• Missile Expansion (Elite Research)
• Missile Expansion (Fungal Hall Access)
• Missile Expansion (Fungal Hall B)
• Missile Expansion (Main Quarry)
• Missile Expansion (Metroid Quarantine A)
• Missile Expansion (Metroid Quarantine B)
• Missile Expansion (Phazon Processing Center)
• Missile Expansion (Security Access A)
• Missile Expansion (Frost Cave)
• Missile Expansion (Gravity Chamber)
• Missile Expansion (Ice Ruins East)
• Missile Expansion (Ice Ruins East)
• Missile Expansion (Phendrana Shorelines)
• Missile Expansion (Phendrana Shorelines)
• Missile Expansion (Research Lab Aether)
• Missile Expansion (Research Lab Hydra)