I heard of a place waaaaaay out in the woods - very few people lived in the area - near the Canadian Shield. One day some some Unidentifed People with serious

I heard of a place waaaaaay out in the woods - very few people lived in the area - near the Canadian Shield. One day some some Unidentifed People with serious machinery started drilling a hole. After several days, they went home for the weekend. When they came back, the hole had been filled in. This re-occured a couple more times. The UP never returned.