Just to chime in on this as I was involved with this project. The trucks used to deliver the material and the excavation machinery were used to compact the earth as it was filled in. I seem to remember we handed over the SAW island to the project team pretty much a couple of months after we had finished infilling. Same with SAW Alive. For The Swarm, think it was about a year, maybe 2 after infilling completed that they started on construction for that project. Any ride structures foundations actually go through the infilled material and into the bedrock below. From memory think the SAW foundations go to 50m