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Step 1: The Base
Step 2: Step2
Add a few more blocks
Step 3: Step3
Add some blocks on the side
Step 4: Step4
Add a ladder on the second side block up and some water in the back of the base
Step 5: Step5
Add some more blocks on the already existing ones as well as a roof
Step 6: Step 6
Add a ladder 2 blocks up and more water in the next hole
Step 7: Step7
Repeat a lot then to climb it walk on the corner of the walls and water you should go up twice as fast as you would on a ladder