Stone is placed on the seabed were treatment is required, the vibroflot then penetrates through the stone into the seabed and hence pushes the stone into the seabed densifying the soil.

Alternatively, specially adapted vibroflots, such as PENNINE's 'Aquacaster' vibroflot can be used. Attached to the top of the vibroflot is a stone hopper. As the flot is lowered to the level of the barge the hopper is filled with stone. The flot can then be submerged and penetrate the seabed to design depth, the stone is then introduced into the hole at the tip of the flot via a stone tube attached to the hopper. As with Dry Bottom Feed Vibro, the column is formed as the vibroflot is removed.