Half-Life 2 Walkthrough -> East Black Rock
Sail to the dock where the lambda sign is. Walk around the hangar and enter the "airlock." Dr. Judith Mossman meets us there. Follow her to the elevator. (After the airlock, you should save your game, as there might be a glitch before the elevator – Judith will freeze and won't enter the elevator. You'll need to reload.)
We take the elevator down to Dr. Eli's lab. We speak with him and Alyx, who just entered. After a while, there will be a skirmish between Alyx and Judith, after which Eli will ask Alyx to show us the gravity gun. We follow her. Let's take a look at the tunnel to Ravenholm, which she will show us.
Fetch!
We continue to the junkyard. We receive the gravity gun from Alyx and learn how to attract and throw objects. When she climbs up the dais, we place one crate on top of another nearby and climb up to her. We continue on. We meet her robot dog:
He'll take boxes from the container and throw them. You need to catch them. Then Alyx will suggest a game of ball, which the robot will pull out from under a wooden spool with a large stone on it. You need to catch it and throw it to the robot or simply to the side.
Go to the shore. Don't go through the Rev...
The game will be interrupted by approaching enemies. Follow Alyx back to the airlock before the dump. The robot will also run there. When he opens the jammed door, follow Alyx, but a cave-in will prevent you from following her. She will shout for us to go to the coast through Ravenholm:
We go into the tunnel she mentioned. The robot will open the door. We make our way through the cluttered corridor to the shaft. We knock the lock off the door blocking the stairs leading up.
Source: hl2-rus.narod.ru
We don't go to Ravenholm: Half-Life 2 Walkthrough