The Tomb of Adam is a monolithic building with a facade measuring 2.5 m wide and 9 m high. Entering this building, you arrive in a small room measuring 3 m long and 2 m wide. This is located under the tomb, you can access the tombs, to the north and south of the building. Adam's tomb is upstairs, it is a small cella where we can see a representation of a cross more or less 1.5 m high.
Source: Églises rupestres de Lalibela - Wikipédia