'Tray' expanding below the main level.

Place a ladder and drop back down to the bottom perpendicular block you placed and build/expand a lower level or 'tray' 4 blocks below your original SkyBlock.

Hop out of the water, pick up the water with the bucket.

Swim back up for air, then drop back down through the water to place a single block perpendicular to your column at the bottom of your column directly under your original hole. Drop down and place 4 blocks of cobblestone in a column/tower going down.You can do this by opening a one-block hole in your cobblestone and placing a bucket of water into it, creating a waterfall that you can swim down through.To avoid losing dirt blocks, create a platform or 'tray' underneath your SkyBlock to catch anything that falls off the top.This slab method also has the advantages of preventing mobs from spawning in dimly lit areas. If you craft cobblestone slabs, you can double the surface area you can create with the same amount of raw material.Once you have a supply of cobblestone, extend your platform to the bottom of the island and collect the dirt, taking care not to mess up the cobble generator.

Continue to generate and harvest cobblestone.

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