Grand Theft Auto: San Andreas Walkthrough

Woozie tells CJ that he's unable to swim and needs his help with a mission. He finally reveals he's blind. CJ reveals he's black. All is right and CJ is off to complete the mission.

In order to start the mission, make sure you've had some experience swimming and have sufficient ability to hold your breath under water.
Head to the docks, marked by a yellow blip on your radar.
Head into the red marker. You'll have to swim out to a boat, anchored in the sea.
Once you're in the water, follow the red markers as they wind through the path.
Once you reach the barrier, you'll have to dive below the surface and through the red ring to go under the barrier.
On the other side, continue along the path.
Once you reach the barrier, dive underneath and grab the knife and continue through to the other side.
Another barrier lay in your path. Dive below to swim underneath.
Once you reach the open ocean, be careful of the patrol boats circling the area. Swim underwater and come to the surface for air. Be careful not to move on the surface. Otherwise, you'll be spotted by the patrol boats.
Continue swimming underwater and make your way to the far side of the ship.
Climb onto the platform and up the stairs. You have to head to the bridge. Be careful not to get spotted by one of the searchlights.
Once on the main deck, stay silent. Head around the corner and knife the guard with his back to you.
Continue along. Around the next corner, a guard will be facing you in the distance. Take him out.
Hug the wall to your right and sneak behind the guard facing outward.
Take out the next guard looking off the deck, followed by the next guard near the entrance inside.
Heading downstairs and walk into the red marker to plant the bug.
Go back upstairs and jump off the ship back into the water. Make your way back to shore, marked by the yellow blip on your radar. Again, don't forget to swim underwater to avoid detecting. Come to the surface for air, but don't move.