Babcock has started maintenance work on the UK Royal Navy's Albion-class amphibious transport dock, HMS Albion, at its Devonport Royal Dockyard.
The two-year contract for upkeep and upgrade will include more than 100 alterations and additions, to enhance the vessels' capabilities.
Babcock will also carry out overhaul of all engines and a complete strip-down and extensive maintenance work on all systems.
The upkeep period will cover the blasting and preservation of more than 20,000m² of tank, installation of new electrical cables, and new pipework.
Babcock Amphibious COM team leader Dai Dumbleton said: "There is no doubt that the Albion upkeep period is a unique project which will present some significant issues, with equipment and sub-systems that will be in an unknown condition as well as challenges around obsolescence and replacement spares.
"Babcock is ready and fully dedicated to delivering this project successfully at optimum value to the customer."
Babcock is working on the programme under its surface ship support alliance class output management (COM) approach with the MoD and BAE Systems.
The vessel is expected to start sea trials in early 2017 With plans to replace HMS Bulwark as one of the navy's key capital ships.
Commissioned in June 2003, HMS Albion landing platform dock can operate eight landing craft, of which four can transport and land main battle tanks.
Image: The UK Royal Navy's Albion-class amphibious transport dock, HMS Albion. Photo: courtesy of LA(Phot) Dan Hooper / MOD.