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two types
The Type Two HSL was a 63 ft high-speed launch craft made by British Power Boat Company (BPBC). The craft were used during the Second World War for air-sea rescue operations to save Allied aircrew from the sea. The Type Two superseded the 64 ft HSL, and was itself replaced by the Type Three 68 ft "Hants and Dorset" also built by the BPBC. The Type Two (aka Type 2) was nicknamed the "Whaleback" due to the distinctive curve to its deck and humped cabin.