Submarine camera

Found camera on eBay no 250110471907:
http://cgi.ebay.com/Russian-submarine-camera-SFK-7_W0QQitemZ250110471907QQihZ015QQcategoryZ66638QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
I wonder what it is? Where was it used? History of it. I can not recall such camera on the Net.

He's been selling this one for quite some time, since at least June if I remember correctly.

He says it was used for diver observation.. not sure what that means, but I see a similarity in case construction to my Scientific Zorki S that I recently posted into catalog. Same kind of casing that opens with similar bolt locks. Possibly same manufacturer?

Vlad.