This Biber held by the Royal Navy Submarine Museum, Gosport.[15] It is in a working condition and believed to be the only fully operational World War 2 submarine in existence.[16] The submarine was restored to working condition by apprentices from Fleet Support Limited in 2003 under the guidance of Ian Clark.[17] The restoration featured in the third series of Channel 4's television programme, Salvage Squad,[17][18] during which the craft was successfully test-dived in a flooded dry dock.