Full scale ice trials of the Finnish icebreaker Otso in March 1986 Wärtsilä documentary

In March 1986, the Finnish dieselelectric icebreaker Otso was put through a series of tests in the Bothnian Bay to evaluate her icebreaking capability. This 13minute documentary produced by Wärtsilä shows how the vessel was, among other trials, rammed into a 20metre thick pressure ridge at full speed and beat the more powerful 1970s quadscrew icebreaker Sisu in the famous horse race through the ice. Today Otso and her nearlyidentical sister ship Kontio are operated by the stateowned shipping compan