You need to be a member.
You play the Black Puffle Rescue game, and on the first level, collect the puffle.
Then wait. In the background, you should see a black shadow. Follow it, collecting the bubbles it makes to stay afloat. You will end up in the coral reefs. Explore for a bit, and go down the staircase you see.
The game will end, and you will be in the Underground room. The Key is there, which means you can enter the underwater room, at any time. since i cant can u do it for me i will give u my penguin name and password
you just walk in to it but you have to make sure that its in a clear space
Only members can.
the mine
The Hidden Lake
go to the puffele rescue and the type what you just wrote in youtube
it is on the hidden lake in the lake down
In the mine
Hidden Lake.
in the hidden lake
Go to hidden lake.
Play puffle rescue on the black puffles and find the key on the first level
You will get the key when you have rescued the black puffle in puffle rescue three times it does not work
Hidden lake