If it needed work on the propeller it would be towed into dry dock, as there is no lifting gear around there. It is a suction dredger. Was it dredging around the Canning river locks?
They may have been inspecting the rudder/props. A cheap way to do it rather than pay for a dry dock. It takes time to pump out all that water and and then refill.
The Venture mainly does the Liverpool Bay channels.
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