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Construction has started on two additional Rhine class luxury river vessels for Crystal River Cruises.

Crystal Debussy and Crystal Ravel are due to enter service in spring 2018.

The sister all-suite vessels will each carry 106 passengers, sailing on the Rhine, Danube, Main and Moselle rivers, covering destinations in Holland, Germany, Austria and Hungary.

Work on the river ships is taking place at the MV Werften shipyard in Wismar on the Baltic coast of Germany.

Four Crystal river cruise vessels and three expedition megayachts for Crystal Yacht Expedition Cruises are being built by the company across its three shipyards together with two cruise ships for Star Cruises.

The first two new-build river cruisers – Crystal Bach and Crystal Mahler – are due to be handed over to the cruise line this year.

Crystal chairman, chief executive and president said Edie Rodriguez said: “Today is another crowning achievement in the growth of the Crystal brand, as we take another step closer in further delivering the growing demand for a true luxury experience on Europe