Junon - The Underwater Reactor

Back on the Highwind, head for Junon. Pay the guy at the elevator 10 gil to get to Upper Junon. Head to the center of the town where you'll find a squad training in the tunnel. Follow them into the Underwater Reactor.

When you first get in the elevator down to the reactor, you'll have to fight 2 Submarine Crews. When you get off you'll have to fight 2 more Submarine Crews.

Keep going until you come to another elevator like the one to Lower Junon. Travel through the underwater tunnel to another elevator. Press the button to have it take you down to the reactor level.

Head through the chambers to the core of the reactor. You'll have to battle 2 more Submarine Crews and 2 Underwater MPs.

You'll reach the reactor just as the Shinra and extracting the huge materia. Follow it, but they load it on a submarine before you can get to it. Reno is there, but instead of facing you himself, he lets you fight Carry Armor.

While you were fighting, the red submarine got away. Go to the left to get the Battle Trumpet in the box, then head towards the remaining submarine. Grab the Scimitar and Leviathan Scales on the dock before boarding the sub.

After fighting 2 groups of 2 Submarine Crews, you'll be onboard. Inside you'll get ambushed by 3 Submarine Crews. In the cockpit you'll find the captain with a couple more crew. You can choose to fight them or have pity on them and take them prisoner. If you fight them, you'll battle 2 Submarine Crews and a Captain.

Sit in the seat and choose to start the mission to do the Submarine Mini-game. You'll have ten minutes to chase down the red sub. Afterwards you'll be able to use the sub as another vehicle to explore underwater.

You'll automatically dock the sub at Junon. Head back in and up the elevator. Head to the airport where you'll be just in time to see the plane take off with one of the huge materia inside.

Obtain: Enemies:
Notes: Be sure to morph the Ghost Ship into the Guide Book while you're in the tunnel to the underwater reactor (see Kalm Traveler). You can steal Shinra Alphas from the Underwater MPs and the Captain.