HSS meaning in Governmental ?

High-speed Sea Service or Stena HSS was a class of high-speed craft developed by and originally operated by Stena Line on European international ferry routes. The HSS 1500 had an in-service speed of 40 knots (75 km/h).

Several patents were registered to Stena Line in the development of the HSS, and four vessels were completed between 1996 and 1997. Stena Explorer, Stena Voyager and Stena Discovery were built to operate on the Irish Sea with Stena Carisma built for Scandinavian use. The newest of the craft was renamed HSS Discovery after being sold to a ferry company in Venezuela during 2009.

Currently, none of the four craft originally commissioned by Stena Line operate. Stena Explorer was the last of the vessels to be retired in 2015 when Stena Line cancelled the fast ferry service between Holyhead, Wales and Dún Laoghaire, Ireland. As of November 2019, one vessel is laid up (Stena Carisma in Gothenburg, Sweden, while in 2013 Stena Voyager (on the Belfast-Stranraer route between 1996 and 2011) was sent to Landskrona, Sweden to be scrapped.In 2016 Stena Explorer was sold and exported to Turkey to be converted into a floating office after spending a period of time laid up in Holyhead.