Entrance to the Batcave

Dear fellow DC extended universe wiki users, I was wondering, how Bruce and Alfed enter the Batcave? Since the Batcave is located underneath Wayne Manor, but after Wayne Manor burned down somehow, Bruce and Alfred moved into the Glasshouse, but as shown in BvS, Bruce is able to enter the Batcave via an elevator, as if the Batcave is located underneath the Glasshouse, so where is the Batcave located underneath, Wayne Manor or the Glasshouse?