The Only Easy Day... Was Yesterday - Call of Duty: Modern Warfare 2
After the introductory movie, take out the guard silently by pulling him in the water (and naturally, stabbing him with your knife, which is done automatically for you). Head upstairs, take out the soldier hanging over the railing, then breach the door in this area. The game will play in slow motion the split second the door blows open, and you must dispatch the enemy soldiers inside the hostage room quickly.
ENEMY INTEL #22:
After breaching the hostage room, go up two flights of stairs. In the room up ahead, before going outside, check the metal cabinet to your left to find this intel hidden among the junk.
Video showing the location of Enemy Intel #22.
Go upstairs after securing the area and make your way to another hostage area. Rig one of the bodies with C4, backtrack slightly and wait for the Captain to give it a go. Dispatch any enemy survivors after executing plan B.
ENEMY INTEL #23:
After executing plan B, follow MacTavish into the room right around the corner. You should be able to spot this piece of intel in the cabinet.
Video showing the location of Enemy Intel #23.
Proceed to the derrick building on the top deck. You'll come across more enemy soldiers along the way, and the helicopter needs to be downed by acquiring the Stinger or RPG's inside the building. With that nuisance out of the way, head around the corner, clear the area and go upstairs.
ENEMY INTEL #24:
Or, before going up the last flight of stairs, go through the doorway to your right and check behind the stairs inside to locate this intel.
Video showing the location of Enemy Intel #24.
Approach the smoke screen that your enemy has set up with extreme caution. Use thermal-sighted weapons and make your way to the other side by the outer perimeter to your left. Here, breach the door and neutralize the last enemies of this area.