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Half-Life 2: Episode One Hints
Where are these bothersome barnacles?
1 of 8: There are three groups of two barnacles that you should eliminate ahead of time.
2 of 8: The first group is above the ceiling hole that's right near the power switch. Look up and move around with the flashlight on until you see them.
3 of 8: NOTE: To save ammo, don't kill these barnacles now, but wait until after you throw the power switch. They'll lower their tongues then, and you can kill the one that's in the way by using the crowbar on him after letting him catch you.
4 of 8: The next group will be dangling its tongues right in the way of your sprint-jump from the long and formerly tipsy walkway segment to the small one.
5 of 8: Get up on the small walkway segment and look straight up through the ceiling hole to see and shoot the two barnacles up there.
6 of 8: NOTE: You can actually make the jump later without killing either of these barnacles if you want to save the ammo.
7 of 8: Now jump from the small walkway segment to the broken-off pillar and crouch-walk slowly along the brown pipes while looking up.
8 of 8: There are two more barnacles up past a ceiling hole that may catch you as you jump to the metal shed, so kill them now, too.