Damen Shipyards have delivered the ASD tugs ‘Karloo’ and ‘Kalarka’ to Half Tide Marine Pty Ltd of Australia. The tugs were built to the highly successful ASD Tug 3111 design, which in common with most Damen vessels, has been the subject of constant research and improvement. Including ‘Karloo’ and ‘Kalarka’, Damen has delivered twenty tugs built to that design, which will now be replaced by the new ASD Tug 3212. That change represents an important historic milestone for Damen, it recognises the high level of sophistication reached by the ASD Tug 3111 and the need to introduce a new design that incorporates all of the best features of that vessel in a new powerful tug for the future with even greater potential.