The HSC High Speed Jet is a 74 m (243 ft) ocean-going catamaran built in 1990 by Incat for Hoverspeed and currently owned by Seajets.

In 1990, as Hoverspeed Great Britain, she took the Hales Trophy for the fastest eastbound transatlantic journey, making the run, without passengers, in three days, seven hours and fifty-four minutes, averaging 36.6 knots (67.8 km/h; 42.1 mph).

[3]) Sea Runner (2008–2011) and Cosmos Jet (2011–2015, when she first began operating for Seajets).

She entered service on the Portsmouth to Cherbourg route on 12 July 1990 operating three round trips per day.

Power is supplied by four Ruston 16RK270 V-16 marine diesel engines each with a 3600 kW (4825 hp) at 100% maximum continuous rating (MCR).