Junon is a City, which has a rundown village below it, and an Airport and Seaport on the main City. It's most distinguishing feature is a Giant Cannon, Sister Ray, facing out to sea.
You have to make your way from the Village, up to the main City. Once in the City you have to find out what the Shinra are up to, infiltrate the Shinra Troops, and then leave the City by ship.
First of all head down to the beach, after you have killed the boss (see below) you have to bring the girl back to life using CPR, as far as I know you cannot fail on this section. The girl will give you the second Summon Materia of the game, Shiva. After this go and talk to her inside her house, she will tell you how to get to the upper city using her dolphin.
You have to blow a whistle to make the dolphin push you into the air, this is all about timing and shouldn't cause too much of a problem. Once you have climbed up into Junon, head past the airport and down into the building. Here you will be cornered by a Shinra general, and you end up having to pose as a Shinra Soldier.
Once you have finished learning the movements, follow the others out. You will be told to join in the parade, this can be tricky but is possible.
After you have completed the parade, head left until you reach the Seaport. There are a few buildings to explore on the way, which are well worth going into. Once you reach the Seaport you have to perform one last salute for President Rufus. You will recieve a prize for your performace, but you won't get rumbled if you do really badly.
Once this has finished you will find yourself on the Shinra Ship.
When you go down to the beach you have to face Bottom Swell.
You find yourself back in Junon after you visit the Whirlwind Maze on Disc 2. Get ready for another FMV fest!
Cloud is now no longer in your Party, so you control the other characters for a while.
First of all you have control of Tifa, after Barrett informs you of Meteor's arrival you control him. Just follow the guards downstairs.
Now a confusing series of events starts! Tifa is locked up inside a Gas Chamber, but then Ultimate Weapon attacks the City, giving you the chance to escape.
Barrett and Cait Sith decide to head towards the Airport, and Tifa has to escape from the Gas Chamber.
Press the following to free her from the chair :-
Now that she is free, Tifa has to escape along the Cannon. She meets up with Scarlet and has a slapping match! After this is over you have to run to the edge of the cannon, where the rest of your party will pick you up in the Highwind!
Now that you have the Highwind, you have the means to explore every part of the World Map. There are places you can reach that you couldn't reach before, including Mideel which you couldn't reach before.
After Cloud rejoins your party you have to go after the Huge Materia inside the Underwater Reactor underneath Junon.
Head up to the upper city, and take the lift which is past the Shinra Troops that are on a parade.
Head through the tunnels and fight off the Guards. You should reach another lift that take you to a transparent underwater tunnel.
When you are inside the transparent tunnel you will fight a Skeleton Ship. If you Morph this, it will turn into a Guide Book. You should take the Guide Book to the Old Man in Kalm, and he will give you the Underwater Materia for it.
You should pass through the tunnel, and eventually come to another lift. At the bottom of this lift is the Submarine Docks which lead to the Mako Reactor.
Make sure you save your game before advancing any further, as there is a difficult Boss coming up.
After fighting off even more troops, you will learn that the Huge Materia is being loaded into the Red Submarine.
After defeating the boss, you need to enter the Grey Submarine, and this will lead you into a Sub-Game.
As usual the Controls are explained to you. The aim of the game is to sink the Red Sub. You are given 10 Minutes to do it in, but I've never taken more than 30 seconds to do it.
When you complete the Sub-Game, you are given the Grey Sub, and you can now explore the Underwater section in the middle of the World Map.
BEWARE! The Big Green thing swimming around is the Emerald Weapon. Avoid it at all costs until you are much further into the game.
Head South and look for the Red Sub that you sunk, when you get near it you will receive the Huge Materia.
There are a few areas underwater that you should visit.
When you have finished underwater, head back into Junon, and go up to the Airport.
Then you are told to head to Rocket Town.
Before you get into the Sub, you have to fight Carry Armour.
