Jm OTSO (OIRT, LR/IMO 8405880) Valmistunut/Completed 1986.1.30, Helsinki, Wärtsilä-yhtymä Oy, Helsingin telakka.
9130 displacement, 21846 kW (diesel electric) 99.01 m x 24.21 m x 8.00 m. Shipyard no. 472. Sister ship KONTIO.
1986.1.30: OTSO, homeport Helsinki. Board of Navigation. 2015: converted to Polar class icebreaker.
