Great Western Dry dock was built in1839 of pennant rubble and brick. It is bow-ended and brick based, with a curved section to the entrance. It has stepped sides and iron caisson single-leaf dock gate. It was built for the construction of Brunel’s SS Great Britain, launched from the dock in 1843.
The SS Great Western was designed by IK Brunel and built by shipbuilder William Paterson at a shipyard on Wapping Wharf from 1836. He then became responsible for building the SS Great Britain at Great Western Dockyard.
Source: Guardian 18th April 2020
The BBC News Report from 1970:
When thousands watched Brunel’s great ship return to Bristol