 The liftboat usually moves on location on a side of the platform where no obstructions or pipelines are observed, lowers its legs and jacks up out of the water.Because the pads of the liftboat are sitting on a muddy, unstable seafloor, most liftboats practice a safety measure called a preload, where the boat jacks-up the absolute minimum to clear hull from the tips of the significant wave heights, fills its holds with water for weight and allows the boat to settle in the mud for several hours before dumping the water and jacking up to work height.If the mud of the seafloor gives way under the liftboat, it can fall into the water and put the lives of the crew in danger.