Finnlines has opted to lengthen another two of its Breeze-class Ro-Ro ferries.
The Grimaldi Group subsidiary started its €70 million (US$85.8 million) energy efficiency and emission reduction investment program in 2017 by lengthening four vessels.
Finntide and Finnwave have since returned to service, with Finnsky and Finnsun to be lengthened by the end of May.
Under the options, work on the 2011-built Finnbreeze and Finnsea will be carried out from September to December.
After the modification, the vessels will be 217.7 metres long and each have a capacity of around 4,200 lane metres.