I did two trips on the Northumbria.
The first one started in drydock (Lisnave) and the second one ended in drydock (Sembewang).
I was told by the regular RO, who had been on her since maiden voyage, that they had no idea what they were doing when they built her. They just multiplied all the figures from the next size down that they'd built.
One of the chief stewards on her had been a welder when she was built and I'm surprised he dared to sail. She was falling apart when we went into Sembewang drydock with cracks across the main deck in way of the manifolds and very large "I" beams from under the deck found resting on the ribs at the bottom of a tank.
It was the first time I'd ever seen a special room full of strain recorders to try and find out how she would behave. She was certainly very flexible.