Edmund Nuttall has won a £35M contract to modify the dock at Rosyth, Dunfermline, in preparation for the assembly of two Royal Navy aircraft carriers.
The contract was awarded by Babckock Marine, clients for the huge job. The docks will be used to assemble two 65,000 tonne aircraft carriers - the HMS Queen Elizabeth and the HMS Prince of Wales.
The total £50M investment will go towards the dry dock modification and acquisition and installation of the largest "Goliath" class crane in the UK at Rosyth, to put the ships together.
Defence Secretary Des Browne said: "This is a significant investment for shipbuilding in Rosyth and a symbol of our commitment to the two new aircraft carriers which will be the largest ships ever sailed by the Royal Navy."
Edmund Nuttall's Chief Executive Martin Rogers, said yesterday: "We are understandably delighted to have secured this major package of work, extending a long standing and successful relationship between Nuttall and Babcock at Rosyth. We are looking forward now to starting work on site".
Babcock International Chief Executive, Peter Rogers, said: "The award of this contract is the culmination of a great deal of hard work by the Babcock Marine team and Edmund Nuttall, together with our colleagues in the Aircraft Carrier Alliance including the Ministry of Defence, to ensure that the Rosyth site is ready to play its part in what is the most exciting defence project for many years."