Metal Gear Solid: Portable Ops/To the Plant

Snake is back, and now you need to head to the Plant.

Before going to the Plant
As you can see in the side bar, now is a good time to rescue Raikov if you can. You can also recruit Sigint. But there is also another person to recruit, and for this you will need to put spies in the Harbor.

Harbor
You will need to go inside the boat, and drop down to the ship's hold. You will receive a call and return to the map. The recruitment will continue later.

Preparing for the next mission
The next mission will include a Boss Fight, so you should save beforehand, and make sure you come with RPG ammo. A Body Armor could help. If you were using Jonathan, remove any valuable items from him.

Plant
You need to infiltrate the Plant in order to destroy Metal Gear. But of course, Metal Gear will be manned by a certain someone, and there will be a Boss Fight:

After the fight, there will be a cutscene and you'll return to the map. You will need to put spies in the Silo Entrance until you get a report, put spies in the Ravine, then wait.