Sisu (1976 icebreaker)

Sisu (Callsign OHMW) is a Finnish icebreaker of the Atle-class icebreaker built in 1976 in Helsinki.

Her sister, FINNISH ICEBREAKER Urho, is nearly identical. Sisu has accommodations fitted with classrooms for maritime students. Urho's accommodations are reserved for public relations uses.