Such barges need to be towed by tugboats or pushed by towboats. Barges are usually unpowered and must be moved by tugboats or towboats. I and II brought brief revivals of shipbuilding with construction of schooners, tugboats and barges. The shipyard has built and delivered some tugboats and barges to some private organizations. Typically, offshore salvage is conducted from pre-outfitted salvage tugs and other tugboats. The Port Group has 140 workboats, including tugboats and barges. Some tugboats serve as icebreakers or salvage boats. Some tugboats and small sailboats were stranded on Rocuant Island near Talcahuano. It also operates dredges, tugboats and patrol boats of height. Fixed installed thrusters are used for tugboats, ferries and supply-boats. It is applied on offshore drilling ships, tugboats, and ferries. The floating dock was constructed in England and towed to Singapore by Dutch tugboats. Lighters are usually not fitted with engines but are towed or pushed by tugboats. That team succeeded in planting charges on two tugboats moored in the basin. It also rents out various vessels such as floating cranes, tugboats, others.