Deep_Directory_Structures

   OpenVMS 7.2 and later supports deep nesting of up to 255
   directories with the restriction that the total directory
   specification must be no longer than 512 8-bit or 16-bit
   characters.

   For example, a user can create the following directories on an
   ODS-2 or ODS-5 volume:

   $ CREATE/DIRECTORY [a.b.c.d.e.f.g.h.i.j.k.l.m]

   A user can create the following directory with a long name on an
   ODS-5 volume:

   $ CREATE/DIRECTORY -
   [.AVeryLongDirectoryNameWhichHasNothingToDoWithAnythingInParticular]