I need to run a cat 5 cable from on room to another in a house that has 12 ft ceilings. At about 4ft & 8 ft in the walls there are cross beams which there are no holes to run my cable through. Can someone tell me how to get my cable down these walls ? Do I need a 10 foot drill bit or something ? There are no outlets or other passageways for me to run in either. This is a million dollar house and I cant be puttin any holes in the walls etc.... Thanks You for your help !