periscopes, information from the radar and ESM masts and manual inputs such as navigational data.
The external communications system provided Upholder with reception facilities across a wide spectrum of radio frequencies and transmission within the military, HF, VHF and UHF bands.
By making optimum use of remote control and automated surveillance systems, the ship's company was reduced from the 120 in a similarly equipped SSN Fleet submarine or the 75 needed in the more labour-intensive Oberon Class to just 47. This enabled the Type 2400 to be operated by 7 Officers, 16 Senior Rates and 24 Junior Rates.
The Type 2400 was purpose-designed with unallocated spaces to
