Chryasagon and "Harb" managed to move the large stone blocking the entrance just far enough that it would be possible to squeeze past it, if one were to hold their breath and plunge in, forcing their way through the power of the downward flow. Of course, it would soon be easier to do, if one didn't mind waiting until the room was fully submerged.
On the other hand, that would very nearly be giving up on the mission. The conflict (presumably between the other team and the smugglers) was through the door, and the door was, so far, not opening. Soon the weight of water would make it next to impossible to open the door, which appeared to open inward (now that the hinges were visible).
Rodrigo yanked at the two torch sconces, and only succeeded in putting one of the torches out (what with all the water spraying everywhere). They concealed no hidden levers.