[Spoiler Warning] Guy in the Tank?

[Sergiy]

Okay, so in the Sewers there is a tank that we fill up with water and then he eventually stops screaming, any ideas who that might be, are there any letters/journal enteries that could explain this?

Could it be a possible refrence to...

Spoiler below!

Red?

[Fomzo]

It's in the Cistern, not in Sewers, and thaere was a thread.......let me see.
Here you go:
http://www.frictionalgames.com/forum/thread-6202.html

[Sergiy]

Searched different keywords, Thanks.