[1] As Fortum is a state-owned company, the selling of two oil tankers capable of navigating in severe ice conditions resulted in a written question to the Parliament of Finland by Representative Pentti Tiusanen about whether the ships should be retained in Finnish control as they could be used to lighten a grounded oil tanker in harsh winter conditions.

[11][12] On 19 July 2010 Indiga collided again, this time with her sister ship Varzuga, while being assisted by two nuclear icebreakers in difficult ice conditions.

[15] The highly raked stem, similar to those in traditional icebreakers, was designed to break the ice by bending it downwards under the ship's weight.

[16] To prevent pollution in case of grounding the ships were also built with double hulls and conformed to the IMCO regulations in respect of segregated ballast tanks even though they were regarded only recommendations back then.

[2][15] A year after Uikku 's successful refit Lunni was also extensively modernized by Kværner Masa-Yards' Helsinki New Shipyard in 1994 and became the second merchant ship to receive a newly developed electronic azimuth thruster, Azipod.

Being one of the early designs the Azipod unit in Lunni was of the so-called "pushing" type with an aft-facing propeller instead of the more efficient "pulling" set-up usually used in modern Azipod-equipped ships.

[2][17] As with Uikku, upgrading the propulsion machinery dramatically improved Lunni 's manoeuvering and icebreaking capabilities, especially when running astern.