RPG I: The Necromancer's Revenge

He runs back towards another door, trying to maintain invisibility. He remembers the succubi's conversation about information regarding the trident.
(RPG: if there was any information).

You remember that the trident is hidden in the catacombs, and the only entrance is through the sewers, which are very well guarded, mainly by the smell. You run up and see two doors, what do you do?