Thanks for that link. A really interesting story. I had not read about them in nearly 60 years.
There was also a section on German frogmen operating in the Rhine. The Germans were far less successful mainly due to the swiftness of the river and also how cold it was.
The Germans were attacking the pontoon bridges across the Rhine but those bridges were protected by anti mine nets which the Germans had to cross out of the water and were invariably seen.