To create a new tomb just launch this command:

tomb create -s <tomb size in Mb> <tomb name>

To open an exiating tomb use this command:

tomb open /path-to-tomb/tomb-name

if the key is in a different place of the tomb:

tomb open /path-to-tomb/tomb-name -k /path-to-key/key-name

To close an opened tomb:

tomb close <tomb-name>

To close all opened tombs:

tomb close all