In early 2018, it was reported that USC was looking for a new majority owner for Arctech Helsinki Shipyard which was making heavy cumulative losses and had been unable to attract new orders since 2016.

[16] In late May 2019, Hufvudstadsbladet reported that the shipyard had signed a letter of intent for the construction of two 150-to-160-passenger Polar Class 5 expedition cruise ships to an undisclosed buyer.

[17] On 27 June, the shipyard confirmed an order for two 113-metre (371 ft) expedition cruise ships with capacity of 157 passengers under the name "Project Vega".

[25] On 20 October 2020, Finnish media reported that Helsinki Shipyard was about to sign a shipbuilding contract for a third expedition cruise ship for Swan Hellenic.

[26][27] On the following day, the shipyard confirmed a 150 million euro order for a Polar Class 6 luxury cruise ship with a capacity of 196 passengers in 96 cabins.

[29] The 125-metre (410 ft) SH Diana, slightly larger than its two predecessors, was floated out from the shipyard's covered dry dock in January 2023 and, after completing sea trials, was delivered on 31 March.