RE: H&W eyes £30m contract with Royal Navy22 Sep 2021 14:37
With the risk of being seen as some type of closet researcher I have had a bit of time on my hands this morning and have found a bit more on the dry docking
Rosyth
“ Eleven tugs were needed to make a carefully orchestrated move that could only be done in good visibility and light winds. Although the basin entrance was substantially rebuilt in 2010, there is less than a metre of clearance on either side and just 50cm between the keel and the seabed. All these factors restrict access the facilities in Rosyth to limited periods of opportunity, far from ideal, especially if dry docking is urgent. Every entry and exit at Rosyth will involve a much greater risk of delay or even damage to the ship than almost all the other alternative docks in the UK.”
Also worth noting on chart Belfast is 20m wider and 1.5 m deeper
Then we have the tender
“ Rudders, Shafts and A-brackets, Plummer bearings and shaft removal, Sea Inlet Boxes and Sea Tubes; Complete LR survey of Anchor, chain and cables; Removal and replacement of underwater valves; Inspection and replacement of Cathodic protection systems, ships sensor; Ships Stabiliser deployment, inspection and repair!; Repair of ships underwater paint scheme; Undertake underwater repairs to known defects. In addition to this there will be a requirement to provide a facility for any emergency dockings that may be required”
So it would appear stabilisers have to be deployed
https://ukdefencejournal.org.uk/belfast-and-rosyth-competing-to-drydock-carriers/