I have had the good fortune of having a bees nest down the bottom of my garden for nearly 4 months now. On average their are 10 to 20 bees in and out every hour.It is situated in a bank of soil which i have put a wooden supporting barrier ,two foot high, against. The bees took advantage of a knot hole in the wood, and have been going about their business day to day without fail. To my horror , i have not seen hide nor hair of them since last friday. It is very secluded where it is situated, so they would not have been disturbed by any humans, could someone explain the disapperance please.