There’s a barge over at the Yacht Club at Sam Smith Park. I wondered what that was all about but Friends of Sam Smith Park provided the answer:

We heard via the grapevine that the old dock ramp is being replaced by a new ramp as it is obsolete. Also the club is installing 5 new extensions to the existing docks presumably to accommodate more boats. The barge is a drilling barge. They need to install anchors to the harbour bed to hold chains which attach to the dock.