[PhpBB3] How to recovery an hacked forum?

Hi there,
First of all, I apologize for not speaking Italian.
Here is my problem: I am a global moderator on a forum that was hosted on altervista ( http://mdmwii.altervista.org/ ), but it seems like it has recently been hacked. The webmaster (mdmwii) literally disappeared from the internet since August.
So, I'd like to know if you could repair the site.
Thanks in advance,
-- XeR

Edit: I may looks suspect, but I can prove I am the same XeR:
In my signature, we can see 'Also known as linkleguerier' which is part of the email adress I used to register here and on mdmwii's. http://webcache.googleusercontent.co...&client=ubuntu

First of all, sorry in advance for my poor english :P
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Only webmaster (with ftp access) can work to recovery this forum.
Maybe you can try to contact him and require data login otherwise you can open a new forum and migrate (if you can contact all / most users) entire community.

Thanks for your response :)
The webmaster (mdmwii) didn't connect since August, so I'd better pick the second option.

Sorry for the double post, but, would it be possible to get a dump of the MySQL Database, so our the whole work posted on the forum won't be useless. (Especially threads posted in the secret labs, which can't be seen from google cache).

Thanks in advance, XeR.

@Xer: I'm really sorry but i think, for security reason, only webmaster (with controlpanel/phpmyadmin rights) can dump sql database from his website.

Quote Darkwolf. You must have the "keys "to the server to dump the database, unless the administrator has installed software such as DBKiss.

Sorry for my English.