The Stornes has been built specifically to deploy rocks through a "fallpipe" for structures installed under the ocean.

The recovery ship USNS Grasp has recovered downed aircraft, towed sunken vessels and cleared harbour debris.

Follow along as the world's top cruise ship, the Crystal Serenity visits Sydney harbour, the port of Melbourne, Bali, a large-scale furniture load in Semarang, Indonesia and the port of Singapore.