The Customs Vessel DLC for Ship Simulator Extremes is now available as a free download.
From Paradox Interactive
Customs Vessel tasks players with the role of a maritime customs officer, responsible for upholding the law and ensuring nothing fishy gets smuggled into the harbor. Piloting a brand new customs ship named Zilvermeeuw players will embark on two exciting missions which include searching vessels for contraband as well as high speed sea chases to apprehend ships evading inspection.
VSTEP developed Customs Vessel with guidance from The Port of Rotterdam Customs Authority and the Customs & Tax Museum in Rotterdam to ensure the most realistic gaming experience.