You destroy the undersea city.

There isn't enough time to get help. You've got to do this on your own. You try to think of a plan. You could possibly shoot a bullet through the glass dome to break it, but you'd be sacrificing yourself.

Just then, you see a line of people being herded past the checkpoint. They have chains around their ankles. Some of them are crying, but most seem resigned and hopeless. Slaves! In that instant, you know you must free those people before you destroy the city. You peek speculatively at the submarine. The men in the green uniforms are still unloading cargo.

Suddenly, the rope you're hiding under is yanked away! A man in a green uniform stares down at you, shocked. Without thought, you whip out your gun and shoot him. Luckily, the silencer is always on your gun, so no one heard. As you look at the tiny trickle of blood from his head, you suddenly have a plan.

Within minutes, you are moving toward the checkpoint in a green uniform, your long hair tucked inside your cap. You know you won't pass for one of the greens if anyone looks at you closely, but you think you can make it into the city. You stride past the checkpoint without slowing down, nodding at the guards. You walk swiftly up the street and around a corner. You're in!

Quickly you strip off the green uniform. You're wearing your own clothes underneath. You pause, pressed against the side of a building. The line of slaves marches by, prodded along by the green-uniform men. You follow nonchalantly behind. You see the slaves enter a large building that looks like a warehouse without windows. No doubt that building is the prison where the slaves are kept.

You look the other way and see a tall building. If anything ever looked like a headquarters, this building does. You walk over to it and enter the revolving doors. There you see a familiar-looking Chinese man with a mandarin-style moustache and a large briefcase going up an escalator. You follow him. He goes down a hall and through a set of swinging doors.

A noise behind you makes you jump. You turn and see a young girl wheeling a cart covered in an elegant white tablecloth. The cart has tea and scones on it. You look around. No one is in the hallway. You walk toward the girl and smile. She smiles back. Then you crack her on the back of her neck. She crumples to the floor. Quickly, you put on her apron and little waitress hat. You bundle her limp body onto the lower part of the cart and smooth down the tablecloth. You stand away and look--you can't see her at all. Satisfied, you wheel the cart through the double doors.

What you see inside makes you freeze with shock. The room is an immense strategy center with large computer screens on the wall. They are tracking every submarine in the world. In the center of the room is a large conference table with men of every race seated around it. The Chinaman is putting the briefcase on the table, but he doesn't open it. Suddenly mindful of your disguise, you move deftly about the table serving tea.

"That's the plutonium?" asks one man. The Chinaman nods solemnly.

"With it, we can destroy civilization," he says. Everyone at the table now has tea, and you now know what the goal of this infernal terrorist group is. You calmly wheel the cart out of the room, abandon it and your disguise in the hallway, and make your way back over to the large warehouse building. You get out your gun and open the door.

To your surprise, no one is guarding the door. But you can see that the slaves are all chained to workstations. They are all turning large wheels.

Keeping against the wall, you slowly move through the warehouse. In a dark corner, you find a stairwell. Swiftly you mount it. It ends at a closed door. Once again, you pull your gun and burst through the door. Inside, two men turn and stare. Before they can react, you shoot them both. Looking around, you see that they have several monitors in the room. Most of them show the slaves below, turning the wheels. But one seems to show the amount of air pressure inside the glass dome.

You suddenly understand what the slaves are doing. If they stop turning the wheels, the ocean will rise through the opening in the floor and fill the dome. This is how you can destroy the city! Grabbing a ring of keys from the waist of one of the dead men, you hurry back down to the ground level.

In less than twenty minutes, you are leading a mob of freed slaves through the city. As the green uniforms see you, they rush madly for the warehouse to turn the wheels themselves. As you suspected, they are more concerned to save themselves from drowning than to stop some escapees.

As you approach the submarine, a large group of guards heads toward your mob. The escaped slaves hurl their chains through the air and knock out many of the guards! You shoot down those that open fire on the mob. Within a few minutes, you and your group are climbing inside the submarine.

You swiftly head for the helm of the submarine. Your cohorts come with you and grab the crew, pulling them out of the way. Luckily, you know how to operate a submarine. (French spies have an amazing cache of knowledge.) You bring the submarine under water and a good distance from the undersea city. Then, you shoot a torpedo through the water. The undersea city is now destroyed.

You return to Shanghai with the submarine, cheering the escaped slaves as they turn their faces to the sun they thought they'd never see again. Then, you turn the green-uniformed men over to the authorities.

You've saved the world! Your work is done! There's nothing left to do but return home and report.