Having made a journey across the Atlantic Ocean on a submarine, Indy arrives at a secret naval base. Donning an enemy disguise, Indy reunites with Marion and both decide to make one last attempt to get the ark back.
- True Adventurer: 40000 studs
- Characters Obtained: Indiana Jones (Army Disguise), Marion (Nightgown)
- Library Characters Unlocked: Enemy Guard
- Artifact: Ark of the Covenant
- Parcel: Artifact Detector
Submarine Dock
First, pick up the box located near some crates and move it over the bridge on to the green pad of the submarine and place it there. Then, swim to the other side and dispatch the four soldiers there. Move to the left of the area and use Indy to pull down a ladder, then climb up it. Have one of your characters jump on the dark grey platform, then switch to the other character and turn the crank at the back wall to move the first to the other side. Switch again and pull on the orange switch to cause a ladder to drop down, letting both characters up easily. Have both pull the levers on either side of the door at the same time to open up a new room. Defeat the guards inside and pick up the box. Walk up to the crank near the water and switch characters to turn the crank (the computer partner will automatically do that if you're playing alone). Put the box on the green patch, then use the parts to build the submarine's gun. Two panels will open up revealing targets behind it. You need to hit both green targets enough times to raise the ladder between the two triangles. Once the ladder is up, climb it and move to the left for a rare purple stud, then to the right to the exit.