Dredges and a jack up digger barge have been deepening the entrance and harbours channels for the last couple of years to allow bigger container ships into the harbour.
This is the jackup digger. Actually I have no ideas what it really called and I guess its function is digging out very specific spots the larger dredges miss. It looks to me like a more precision approach.
Jack up piles in the bow of the barge being lifted as fizz boats head home.