The floor of the main room was covered with a black and white mosaic. Benches lined the walls. A fresco portraying Mithra (or a torch bearer) is on the western wall. The only other ornamentation was a marble block, roughly carved into the shape of a snake. In the floor near the entrance a circular pit was found covered with a marble slab, with a terracotta bowl containing the remains of staves of wheat. A rectangular hole in the floor gives access to a small tunnel that runs under the center of the main hall into an adjoining room, where there is an entrance/exit with staircase. This, a unique feature in a mithraeum, has been controversial. Most scholars view this as a "fossa sanguinis", a ritual pit over which the bull at the center of the Mithraic mythology was slaughtered, bathing one or more initiates in its blood. Others think it was used as a sort of stage trap door allowing a person to stage a surprising entry into the room.