If you are wondering why I take an Prayer potion it's in OSRS Gold the event I have a DH tunnel. You should always keep a prayer in mind when fighting DH as he could hit fairly hard. I typically get a KC of 20 or so, it doesn't help getting Barrow Items more frequently but it is helpful in getting more runs/racks and so on. It's as simple as using the ecto following you loot the chest, recharge your prayer points at an altar in the temple (I did not remember the name but I think you know the meaning of this.
Begin by visiting Karil first. Make attack prayers prayer, strength and defend yourself from the range. Then, strike him with your unique attacks. Finish him off by using the ice spell. Run out. Go to Ahrim. There should be around thirty prayer points. Make the switch to range gear, pray magic (and Eagle eye if are blessed with it). Get out as soon as he's dead.
You should go to Dharok next. At this point, you'll have about 1-5 prayer points remaining. You can pray melee for his initial hit, then hit him one time using a blitz of ice, then step away. You should be able to score 5 more hits;
He'll begin moving after five hits, which means you should be far from him if you're trying to take five hits, or else, you can hit him 4 times before hiding behind his tomb. After a couple seconds, make your way to a distance from him and take another hit before it reaches you. Then repeat. Then, finish him off in this way.
Assail the remaining 3 brothers in the same fashion you did Dharok in any order you choose. What to RS 2007 Gold do for the tunnels: Depending upon which brother you encounter in the tunnels, you should set your quick prayers to the correct protection. If you see him, don't feel panicked (you'll survive the first couple hits) Use the prayer pot fast and pray quickly. Make sure you finish him.