Then it was on to endless passageways full of Tzimisce monsters that looked like rejects from Half Life.
So I decided some judicious noclipping was in order. Got stuck in the 'Pump Room', a section described in the wiki as 'the most notorious part of the game' due to a badly thought out puzzle making escape near impossible. Things literally turned to shit very quickly in the interminable sewers levels on a search for the Nosferatu warrens.