A square door, very sparingly ornamented, opened upon a passage leading to a chamber of more or less extent.

From the further end of this chamber opened a second passage leading to a second chamber, and thence sometimes to more chambers, the last of which contained the sarcophagus.

In some tombs, the whole excavation is carried down a gently inclined plane, broken perhaps by only one or two low steps between the entrance and the end.

In others, the various parts follow each other at lower and lower levels.

In the catacomb of Seti I.( fig.