where is the crown block located on the rig
Crown block A crown block is the stationary section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite and above the traveling block.
HMS Queen Elizabeth (R08) Construction of Queen Elizabeth began in 2009. The assembly took place in the Firth of Forth at Rosyth Dockyard from nine blocks built in six UK shipyards: BAE Systems Surface Ships in Glasgow, Babcock at Appledore, Babcock at Rosyth, A&P Tyne in Hebburn, BAE at Portsmouth and Cammell Laird (flight decks) at Birkenhead.[26][27] Two of the lower main blocks, together weighing more than 6,000 tonnes and forming part of the base of the ship, were assembled and joined into one piece on 30 June 2011.[28] On 16 August 2011, the 8,000-tonne Lower Block 03 of Queen Elizabeth left BAE Systems Surface Ships' Govan shipyard in Glasgow on a large ocean-going barge. Travelling 600 miles (970Â km) around the northern coast of Scotland, the block arrived at Rosyth on the evening of 20 August 2011.[29] On 28 October 2012, an 11,000-tonne section of the carrier began a lengthy journey around the south coast of England, avoiding bad weather from the shipbuilding hall at Govan to the Rosyth dockyard; it arrived on 21 November.[30] The forward island was constructed at BAE Portsmouth and attached on 14 March 2013; the aft island was attached in June 2013. The ski jump was added in November 2013,[12] leaving just the elevators and radar to be lifted into place.[12] By September 2013 Queen Elizabeth was 80% complete internally.[13] A journalist reported that computers on the vessel appeared to be using Windows XP, which has raised concerns about its vulnerability to a cyberattack.[31][32]