Petcan will keep opening the pipe

Petcan manages to open the 3rd and last pipe. Water floods into the room and flows out into the tunnels washing the goblins bodies away with it. Pepin uses his rope to help everyone climb up the access shaft which leads to an empty warehouse.

(You can all describe what you do when you first reach the abandoned warehouse.)

Zenodor climbs up into the warehouse, and takes a good long breath of what he hopes to be fresher air than the sewer they have just been in. He takes a look around to assess where they are, but doesn't expect anything dangerous (expecting to have returned to the relative safety of the city).

If he has time, he will use Prestidigitation to clean himself while Irraxan can have a closer look around the warehouse.

Petcan is looking to climb up high, have a look to see what sort of impact this has had.

Randall:

Staying at the top of the ladder for a moment to make sure the water is directed away from all his friends, Randall says, “Let’s use the sending stones again to let them know the water is flowing.”

if the guards haven’t gotten free yet, Randall lowers the water level by up to 20 feet.  Once they are confined clear, he raises it by up to 20 feet once all his party is clear.

Tempe looks around to see if any, thing is dangerous here "This may be a good place to take a rest. If we have time." 

18 Perception

"With the water flowing we should probably stay in contact with the guards to hear about any breaches. Other than that a rest should be fine I guess"

You all safely exit the pumping station. You signal the soldiers to flee the sewers which will be flooding continuously. Climbing up into this empty warehouse gives you a safe place to take a short rest (5 min) or long rest (1 hour). Irraxan quickly scouts it out and finds it to be an empty 40 by 60 warehouse with double doors at the front and back.

"I suppose we should check out what is on the other side of those doors before we spend any significant time here"

(I.e. let's try to look through cracks/keyholes. If we don't know where we are and can't blockade the doors from the inside, anything longer than a 5 min shirt rest seems a bit risky)

Peering through the backdoor shows a dimly lit office with a desk and a couple of chairs on one side and a few small crates stacked on the other side.

Looking through the front door reveals it opens onto a side street.

"I suggest" Tempe shrugs  goes to the door and looks then summons a bald eagle "Baldit go to the roof and see what is happining in the city" Tempe walks to one of the chairs and sits down. He then goes into Baldit's mind to look around.

22 perception.

Pepin makes himself comfortable for the rest.

Petcan is also in pretty great shape, and will stand watch near the door, enjoying the aid of the magic helm in detecting the thoughts of anyone close enough

Randall:

Sitting down to rest and releasing his spell concentration, Randall says, “Let’s stay in contact with the guards and be ready to move back down and shut off the water when they are ready.”

Zenodor will sit down and rest. If he can get comfortable enough, he will happily close his eyes to rest properly - secure in the knowledge that his magical Sword will alert him if anyone tries to attack 

Baldit doesn't see anything out of the ordinary happening in the city.

You all get the benefits of a short rest.

Also you all advance to level 10.

((Taking lvl 8 artificer for war caster feat for lvl up. Also, how long has it been since we entered the sewers? I cast aid back than which last 8 hours. So wondering if that is still there?))

Petcan seems to be growing quite hot indeed, with the glow of fire in his chest visible once every few minutes of ordinary breathing, now. 

After the 5 min short rest you can all proceed to explore or move on. Perhaps even discuss what your plans are for the immediate or far future. As far as you know the sewers will remain flooded for now, perhaps until the tunnels the goblins dug are collapsed.

"We should probably collapse those tunnels, right?" Petcan asks tentatively.