Arctic winter transits by ultra-high ice-class merchant vessels are about to become standard practice following a successful voyage in the worst ice conditions for years.

So believes specialist project cargo shipowner Red Box Energy Services, owner of the ice-breaking heavylift cargo ships 24,500-dwt Pugnax and Audax (both built 2016).

The sisterships are among many carrying LNG process modules for Russian gas producer Novatek’s Arctic LNG 2 project, under time charter for their supplier TechnipFMC.