Water portal

In there could be somewhere in survival where if you add lapis blocks and water you can go there. In there it could be kind of like the nether but water. But to make it a bit challenging you cant add lava and in the floor if it could be a whirlpool where if they fall they cant go back up. There could be new mobs and water ore to make water blocks to build with. It could be a place where beginners can explore before going to the neither and the end