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Half-Life 2 Hints
Secret Grenades
1 of 6: Start by finding where a large red boat is lying around fairly near the tunnel you entered this area through.
2 of 6: Look a ways past it, where all the tall rocks are.
3 of 6: There's one spot where two logs are pointing at a line of rocks, the last two of which have a log laying across their tops.
4 of 6: If you can hit that log "ramp" just right with the airboat, you can sail all the way to the last rock in the series and pick up two frag grenades from the log that's laying on it.
5 of 6: This is a *very* difficult maneuver to pull off, and probably isn't worth it for just two frag grenades, especially since you can get two of them from inside the partially buried concrete pipe, plus more from the dam area later.
6 of 6: TIP: Whether you can get the grenades or not, look around on the ground near these rocks to find a health pack and an armor battery.