Turning back to the others he says, "Were going to have to walk through water.  Be prepared."  He then took a deep breath and lowered himself into the water while taking a defensive position with the spear full expecting someone to jump out and stab him.

Oh, it was not that deep - 2ft of stinky dirty cold water, unpleasant but tolerable.

When Choir with her shining shield descended to the bottom of the long staircase, you saw the big empty room, unlit (aside Adray's lamp and Choir's shield), and completely flooded with already mentioned foul-smelling water. Room has about 9-foot-high ceilings, braced with wooden beams, and stone walls are hewn from limestone. From the entrance it looks like there are 2 exits from the room.

"Left er right?" Fran would say.

Choir is going to walk very carefully, feeling her way as she goes, weighed down as she is with heavy chain mail.

When she had imagined sneaking into the baths after hours, she had imagined being in MUCH cleaner water. They were all going to need a bath from this bath.

”Go left, it is always left I think in novels, and I’m left handed” Polly wispers from the back. 

"Left, right, makes no difference to me, I say either way we clear everything out.  Less cultists less human sacrifices.  So left is fine."  Turning to Nibs he says, "you up to first big guy or want me to go?"

Adray will move with either option so feel free to continue without another response.

When Adray turns, he notices Ordrag hanging back, looking warily at the water. Without looking up at Adray, Ordrag says:

Er, yeah, you can take the lead on this one mate. Me will come behind, back you up, eh.

Ordrag walks very tentatively in the water, following exactly behind Adray and walking almost directly in his footsteps, constantly looking down at the water.

While brave fresh squad of Flaming Fist warriors made their way through the dirty water they noticed one thing - no signalling system of any sort. At least, nothing visible - rough stone walls, water, rotten wood - and nothing more around.

Chosen path turned into the long dark corridor (or would be dark if not for the Choir's shield and Adray's lantern), looked like whoever used the labyrinth did not need any illumination. The floor of the corridor was slowly ascending. At some point, there were several stone steps, that brought you to the dry part of the corridor and eventually to the door, made of soft, rotting wood and without any lock on it.

Ordrag breathes a sigh of relief to be out of the dark water-logged section and back on visible ground. He pauses near the door and appears to be catching his breath, and doesn't make any immediate moves toward the door.

Adray signals a stop and indicates the door.  He gave them all a look to see if they were ready.  Once confirming they are.  Adray will push open the door and hold the lantern aloft figuring that the sudden change in light might disorient someone.  He will then see what he can see.

Perception for threats 17 + 1

Polly comes up on the other side completely drenched. Being only 2 1/2ft tall had forced her to swim through the smelly water. Frustrated she mumbles the words “brakka adurna” and her cloth went from wet and dirty to dry and clean over a span of a few seconds.

Pleased with the result she ask around if anyone else want their clothes dried and cleaned up. 

"Please" Fran would whisper to Polly appreciating the offer for clean up. "It'd be a good idea for everyone so we don't leave tracks?" Then she'd ready to continue Adray's lead into the next area.

"Please," says Choir. She raises her hands up to let Polly's magic hose her off.

As if teasing the group, the room behind the door appeared to be empty again and quiet as a grave. This time, though, the monotonous dirty-grey colour of the walls broken with some decor on the doors. There are three of them (the doors) Northern - that group just entered through, Eastern and Southern. The western passage is open (it goes without saying, opened into the darkness). Carved into each of its three doors is a full-figure depiction of one of the Dead Three. At least Polly (that previously gave you a lecture about those lovely gods) recognizes them as such.

East Door bears a carving of Bane, god of tyranny, who is depicted as a tall, armored man wearing a bucket helm. His right gauntlet is painted black and clutches a set of shackles.
North Door decorated with a carving of Bhaal, the god of murder. He's depicted as a powerfully built, skull-headed roan with long, curved blades where his hands should be.
South Door bears a carving of Myrkul, Lord of Bones. He is portrayed as a cloaked figure whose face is hidden under a cowl. In his skeletal hands, he clutches a screaming human skull.

To Adray:

 “Which way do you think we should go? Neither seem very inviting..”

Polly goes around to every door and look for clues to where to head next. investigation: 14

There are no clues - dirty floor is dry. Certainly, someone was here before, but there were many of them and, judging by the dirt, they were coming and going in every direction. Doors and walls have some cracks, though much too narrow fo Owis to go through, the open Western entrance smells like the "water room" you just left - or more like it, than any other direction.

All Polly could say, people go through that room often enough.

Ordrag votes for the eastern door. Might as well, since we started that way ... feels like huggin the coast rather than headin for open sea.

“Sounds good to me”

Adray shrugs his shoulders and moves to the east.  Keeping to the same routine as before, he opens the door. While flashing the light up to hopefully blind anyone and steps though.

Choir follows, peeking over her glowing shield.