We have a hive in our back yard for going on five years now. It's located under a garden shed between floor joists. A crack in foundation allowed them entrance. Year before last they had left, no activity at all. I went so far as to cut a hole in the flooring above and insert a camera and was able to take picture of developing hive. This last winter I reached in thru the access hole and pull a piece of the hive loose, it was wet and empty, I figured they were gone. Not, this spring they're back thicker than ever. Is this normal, to leave for a year or so and come back? The location is horrible, when we get a lot of rain I got a feeling I have standing water just below the hive. I've video them in action, I'm guessing I have a good thirty of so every fifteen seconds coming and going. What should I do for them to remain and be happy?