There could be surprises under your home. A medieval tunnel was shockingly discovered under a residents property after a crew was relocating a pole, "I have been involved in other excavations where we have discovered old wells and cellars not shown on any plans, but nothing as exciting and impressive as this."
They think it might be from the 1100s, "For now, we have back-filled the trench and reinstated everything and we are planning an alternative route for the customer. It could take years before the investigations are concluded." More here.