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The Orange Box: Half-Life 2: Episode Two Hints
Armor Battery Tip
1 of 4: After you surface, look around to see that there's a barnacle tongue dangling down into the water near you.
2 of 4: There's also an armor battery up on a rocky ledge that's very hard to get up onto.
3 of 4: An easier way is to let the barnacle grab you and start pulling you up so you can see the armor battery better.
4 of 4: After you pull it in with the gravity gun, switch to the crowbar and wait until you can whack the barnacle with it.