of recovery systems developed and manufactured by Lamor, each suitable for specific weather conditions. The equipment is fully mechanized, remotely controlled and capable of deploying to operational mode in 10 minutes per side. The fourth system, designed for difficult ice conditions, is an innovation developed by the Finnish Environment Institute. In open water, the ship uses a permanently installed advancing system which consists of outriggers and sweeping booms on both sides of the ship that recover oil and debris from a wide area as the vessel moves forwards with a constant speed of . The polluted material is collected in side boxes inside the ship where they are separated from the water for processing by brush conveyors. The sweeping width of the advancing system is , second only to the Finnish icebreaker Kontio that has been equipped for oil recovery by the European Maritime Safety Agency and has a sweeping width of approximately . However, as the advancing system can only be used effectively in calm seas with significant wave height below one metre, Louhi is also equipped with a special "wave damping tank", an innovation used for the first time in a Finnish recovery vessel, that can be used in combination with the aforementioned stiff brush conveyors and a shorter sweeping boom to collect oil in swell. The system consists of a dampening channel that guides the oil to the recovery system on the other side of the ship. Spilled oil surrounded by oil booms can also be collected by two free-floating skimmers connected to the vessel by a flexible pipe. As the recovery systems designed for open water can not be used efficiently or at all during wintertime, Louhi is also equipped with two recovery systems capable of collecting spilled oil from the sea in difficult ice conditions and clean ice blocks covered in oil. The main recovery system consists of four large brushes controlled by individual crane arms installed on the stern deck. The system, developed specifically for this vessel, has a sweeping width of and recovers oil from the sea as the vessel moves astern in ice. In addition the vessel has two Lamor LRB-series oil recovery buckets that have large rotating brushes that resemble those of street sweepers and are used in a similar fashion. Despite their limited recovery capacity, the brush buckets operated by the ship's cranes have been proven to be effective in