Rohuzar has to cut the trap free of its anchor line.  The rest of the trap weighs only about 8 lbs and he is able to set it in the boat and carefully climb back in.  As Leelan moves back to his seat at the rear, he notices a tooth sticking out of the wood frame of the trap.

6

He's never seen anything quite like it.  It is the tooth of a carnivore, and probably an aquatic one.  It is small... if this came from a humanoid, it likely wouldn't be larger than a halflings tooth.  Other than that he cannot draw any other conclusions.

"Sharp toothed little thing we´re looking for it seems. Perhaps we want to save that tooth for Lady Shelley?" Aubrey comments before pushing pole boat b further out towards the next buoy. Knowledge to determine previous owner of tooth:17

(OOC: Could Aubrey use telekinesis instead to gently push the boat along? It wouldn´t need much force right?)

Leelan pulls the tooth out of the wooden frame and examines it. He does make quick notes of it in his sheets of paper before pocketing it.

"As interesting a find as this is, I doubt it could prove the existence the sea folk we seek. For all we know, this could be a large carnivorous fish. But, there still more to find. Let us press on!"

Aubrey looks across at the other boat and the small tooth Leelan is holding up.  At the distance and at the edge of his mask's glow, it is difficult to make out much detail.  From what he can see it doesn't really look much like a fish tooth.  But then again, Leelan is the monster expert.

It sounds like the group is ready to push on to the vicinity of the next trap.

(Aubrey, the text for the telekinetic feat says "shove" and also says the target is a creature.  While I'm inclined to allow the boat to be a target (why would you be able to shove a person but not an object?), the "shove" seems problematic.  Rather than a slow and steady push... that seems to imply periodic shoves of the boat to make it move... which I think would be both less stable and more uncomfortable for the passengers.  So I think that is plausible... but impractical.)

Aubrey considers sharing his thoughts on the tooth but decides that others like Leelan would know more about this than he could. Instead he moves the pole boat on to the next buoy.

(OOC: I was actually thinking about the mage hand without the hand. A force that could lift 5 lbs could arguably move a pole boat, if only slowly.)

16  11

The two pole boats continue further out into the darkness underneath the docks.  Rohuzar continues to pole his boat, while Aubrey experiments with magical means of locomotion, eventually settling on mage hand to impel the boat and free up both his hands.  They travel a bit slower than Rohuzar's manual powered boat but not enough that they fall considerably behind.

The party is alert for danger or signs of the merfolk, but no one notices anything out of the ordinary, and soon the second bouy is in sight. Unlike the destroyed trap, this one is empty and unmolested.

Just as the boats come together to discuss the next move... there is a large splash somewhere off to your right/ to the east.  It doesn't sound very far but it echoes a bit under the docks and nothing can be seen within the range of anyone's darkvision.  It was quite a loud sound, giving the impression of something like a large rock or a cart falling into the water.

Grugga calls out to the wharf above, "Hey, we've got boats down here!" then he pauses in silence before murmuring to his boat "I wonder if that was one of them..." Louder, he says to both boats, "Should we wait here by the trap and hope it comes to us?"

Rohuzar will hop back in the water to go look for the suspicious activity

As Rohuzar swims off to investigate the cause of the splash Aubrey at first hesitates for a moment as the group lost contact with their leader. "Be ready to go down and help him and try to cover him from the boats for now. Let´s follow him Leelan." Aubreys says to the others, trying to coordinate their actions, and follows Rohuzar, standing up and using the pole if necessary to keep up. Perception to notice cause of splash:24

Guilim will mo ecover to the pole of the boat incase they will need to move faster, sheathing his dagger. He will make sure to pull his halberd closer in order to have it in easy reach.

8  20  2  8

Aubrey cannot see where the splash came from, but based on the sound he thinks the origin point is about 100 feet to your east and perhaps just a little bit north.  

Rohuzar is out in front, wading through the hip-deep water. About 15 feet behind is the boat carrying Aubrey, Grugga and Eskil.  Another 15 feet back (due to lost time transfering the poles and getting back underway after Rohuzar dropped out) is the boat with Guilim and Leelan.  Aubrey, you can just make out Rohuzar's silhouette at the edge of your vision and are able to provide some basic directions for him based on where you think the should came from.  After about 45 seconds....

Rohuzar, suddenly you are standing in moonlight.  The docks open up above you and you can see you have come upon one of the canals that bisect the docks.  You also encounter some aquatic vegetation, as this is one of the few places here that gets any regular sunlight.  The moon is high, full and almost directly overhead.  The wind is much louder not, though down here is does little more than ripple the surface.  You recall Shaemus' warning that the canals are dredged deeper, so you stop momentarily at what you suspect might be the drop off. The canal is about 20 feet wide.  It comes to an end perhaps 40 feet to your feet (south) and continues on, as far as you can tell, all the way to the open lake on your left (north).  Looking around, there is nothing that you can see on the surface.  The others are 6 and 12 seconds behind you, respectively.

The boaters all see the outline of Rohuzar in front of you as he steps out into moonlight.

"Rohuzar, everything alright?" Aubrey says loud enough for the orc to hear him. "Any clue to what fell into the water?" He adds as he poles the boat up to Rohuzars position, but being careful to not get out from under the dock with risk of getting something thrown over their pole boat. Another perception if needed, still wary of dangers:13

Rohuzar puts on Grugga’s invention and gets below the water to see what he can see

perception 11 

investigation 8 

Aubrey's boat catches up with Rohuzar at the side of the canal.  Alert for danger, Aubrey cannot see anything alarming.  Nothing but the wind disturbs the surface of the water and there are no spiders or other threats hanging above.  The sound of the wind does much to obscure other sounds from above, but Aubrey cannot hear anyone above them, either.  Far down the canal toward the lake (100yds+) there is the glow of torchlights up on the topside but that is too far away to have been the source.

As Aubrey and the others survey the scene from the boats, Rohuzar submerges to see what he can see with the mask.  True to advertisement, the mask keeps the water out of his eyes allowing him to see clearly under the water.  And the air tube allows him to breath comfortably provided he doesn't go much further down than just below the surface.

Rohuzar

"I can´t see what´s happening down there." Aubrey says anxiously. He hesitates for a moment before continuing. "Rohuzar shouldn´t be down there by himself, I´ll go after him." And with that Aubrey dives in after Rohuzar wearing his GruggaView6000. Perception if needed to locate Rohuzar:11

Grugga peers after the two who went into the water and informs the others on the two boats, "I don't think we should split up. We should go after them. Let's all go together, I can still see Aubrey's light." And with that he jumps off the boat into the water. Wearing only some pants, he's relatively unburdened except for the pack of tools around his waist and a dagger which he keeps in one hand at all times. He tries to remain within sight of the 3 with him, but also tries to keep moving toward Aubrey's light. Once he gets to the deeper canal, he fits the mask into place and paddles out into the deeper water.

Perception if needed: 2

Rohuzar emerges a moment. “Stay alert, and get me Guilim over here. I think there’s a body.” 

Rohuzar will swim across to the humanoid figure. Was the chain holding it down or is the chain otherwise involved?

5  13  7  15  5  4  6

2

(OK.  We are in... something that requires an initiative order.  No combat at the moment but I need to keep track of what everyone is doing.  At roughly the same time, Grugga and Aubrey have jumped out of their boats leaving Leelan alone in one boat and Guilim and Eskil in the other, and Rohuzar has just surfaced to advise he thinks he may have spotted a body.)

Rohuzar

Aubrey

???

Eskil

Grugga

Guilim

Leelan

Since Rohuzar has already indicated his plans... 9

Rohuzar surfaces, announces he may have found a body, and asks for Guilim.  He then dives back under and swims toward the object he had spotted moments before.  It is near the bottom, 15 feet across the channel and 7 feet down.  This is one round (6 sec) underwater for Rohuzar.  He examines the  object more closely (applying your action for an investigation check).

Aubrey follows Rohuzar towards what he assumes to be the body his boss mentioned scanning the bottom for it by the light from his GruggaView6000.
Perception if needed to spot the body or whatever it was Rohuzar saw:18
He also tries to contact the ´body´ telepathically in case it is alive and has a language. "Greetings, we wish you no harm, we come in peace."
Persuasion if needed to establish peaceful realtions:9

Aubrey

You follow Rohuzar down and get a look at the 'body' that has got him concerned.  This is one round (6 sec) underwater for Aubrey.