The ship Opal, designed and built in Wisła Shipyard, was launched in 1981. It is a passenger catamaran, i.e. a vessel with two parallel hulls and two internal combustion engines. The ship is almost 38 meters long and can take about four hundred and fifty passengers on board. For a few years, Opal was flying foreign flags. Since 2000, it has been owned by the Polish shipping company - Żegluga Gdańska, serving cruises between Gdańsk and Hel. A few years ago, a characteristic white catamaran was also sailing from Kołobrzeg to Bornholm.