THE largest section of the second supercarrier which will be based in Portsmouth has began its journey down the Clyde.
The 11,000 tonne component of HMS Prince of Wales is being transported on a barge to Rosyth for final assembly.
Called Lower Block 04, the section is 20m high and 80m long and houses the hangar, machinery and accommodation spaces.
The final two smaller sections of the ship are due to be delivered by the end of the year.
The first of the two carriers, HMS Queen Elizabeth, is in Portsmouth in late 2016.
The QE Class carriers are set to cost about £6bn overall and will become the centrepiece of the Royal Navy.
Each 65,000-tonne ship will give the navy a four-acre military operating base which can be deployed worldwide.