The pickaxe is just an extra thing if you want to do or not, same with the boiler. Just try to reach to the pump room and choose the "turn on the valve" option. The pump room is right next to the boat escape. Also it's ok to ask others for help!
DreadTLN
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SPOILERS:
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You need to escape through the water way.
But to do that you need to get to the pump room which is literally right next to the boat escape way and choose the "turn on the valve" option and interact with the (!) again in the boat area to escape.
Then click on all white dots you see before the (!) and lose to that "large predator".
SPOILERS:
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The water one. You need to get to a room to make the water clear out the blockage from the water ways to be able to get through it. Then just click on all of the white dots you see. And lose to the big dragon lizard thing enemy to get the cg. Also the spider boss isnt necessary. It just for an equipment that increases potions potency in battle so you dont have to waste them as much.
There are two exists which the game tells you at the start of the dungeon and labelled as (!) for you to know. You can either go an easy way and fight through a bunch of moles/wait until the moles knows you've escaped (you spent too much time) or do some "water works" to be able to go through the other one.
Goodluck, I can't spoil more from here.
There's a small room that's labeled as "Office" with a giant mole inside. So anyway, when you start the dungeon there will be an encounter with some moles that will ask you what kind of worker you are cause you're new (if I remember correctly) , just choose the option that you are a "sus" one and then keep moving on from then til you reach the office to get your work permit registered.
You know you are one when the supervisor mole takes you to some private do some "alone time" with him but then got interrupted.