At the risk of stating the obvious, it's difficult to comprehend how a UK submarine could have achieved this. Good design and average command skills, or average design and good command skills should have ensured that this did not occur.
Interesting statement and I can't help wondering, using the parallel that often appears in respect of aircraft accidents/incidents in other threads, if this is the point at which we should be asking Mike "All the Sevens" to clarify his personal experience of handling a very large nuclear submarine in restricted waters with only the help of a single pump-jet propulsion system.
I wouldn't be hanging anyone just yet, particularly recalling the occasion when a frigate leaving her berth at Guzz "nudged" an SSN on the day she was sailing for an "interesting" patrol. My Admiral described the situation as "the least important ship in the Navy that day striking the most important one in the Navy that day", and there was not even a BOI, far less a court martial.
Jack