This DIY project is perfect for making it look like a bottomless pit in at your Halloween party or Yard Haunted House. Check out what the author says below:
During the day you can’t see into it as it has to be darker outside the drum than inside. I drilled a 3″ hole in the side of the drum and strapped a 25 watt red light bulb to the side. I used strapping tape to hold the light on strictly because I was too lazy to look for another way to do it in a hurry. At night the red light lit it up just enough that folks were attracted over to that side of the yard to see what the eerie red glow coming out of the ground was.