how many levels of subfolders are supported ?

[eluser]EugeneS[/eluser]
any one knows how many levels of controller subfolders are supported ?

i mean next

lets imagine i have folder structure: application/controllers/admin

inside admin folder i have some controller for example "users"
i can reach it like

http://localhost/admin/users/

can i add another folder into the "admin" folder and then reach the controller inside it smth like:
folder structure: application/controllers/admin/aaaa
inside folder "aaaa" will be some controller "aaaacontroller"

can i reach it through the url like this one or not: http://localhost/admin/aaaa/aaaacontroller/


i cant, but no sure should this way work or not, or only one level of the controller subfolders is supported.