Unable to retrieve data from ReadyNAS Duo

Hi All,

I had a ReadyNAS duo which has, for want of better words, "blown up" on me!
I am trying to recover the data off the drive with little success despite vast amounts of reading on this forum, which has been very helpful.
Despite my efforts i seem unable to recover the data all though it appears I can access the system partition without issue.
Below is the output of fdisk -l on the drive in question:

~ $ sudo fdisk -l /dev/sdb

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xd80ce136

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               2     4096001     2048000   83  Linux
/dev/sdb2         4096002     4608001      256000   82  Linux swap / Solaris
/dev/sdb3         4608002  1953092233   974242116    5  Extended
/dev/sdb5         4608003  1953092233   974242115+  8e  Linux LVM

I can mount /dev/sdb1 ok using: ~ $ sudo fuseext2 -o ro,allow_other /dev/sdb1 /mnt/foo/
Once this is mounted i can see the filesystem of the ReadyNAS but cant actually access any of my data:

 $ ls /mnt/foo
applications  c    frontview  lib         mnt      proc   sbin  USB
backup        dev  home       lost+found  opt      ramfs  sys   usr
bin           etc  initrd     media       private  root   tmp   var

applications, backup, media and private all come up as sym links to /c/<respective folder> but there is no data in the c folder.
Additionally, based on other posts, i have tried to do a vgscan, pvscan to try and change into volume group c however:

sudo vgscan
  Reading all physical volumes.  This may take a while...
  No volume groups found

 sudo pvscan
  No matching physical volumes found

Would really appreciate if anyone could assist as I have years of photos on this device, please spare the have you got a backup!
Am i doing something wrong when I mount the filesystem? Should i be looking in one of the other partitions for my actual files?
Any help, anyone can offer will be greatly appreciated!

Thanks in advance :)