So... CAPM320 was one of the mainframe programmes that was part of the Capri suite.
It was a beast. One day, my manager wandered up and dumped a bi-fold printout on my desk that was about 15 inches thick. Thousands upon thousands of lines of code. She said something like: "We want you to re-write and amend this to cut out dead sub-routines, improve efficiency and re-organise the structure to make it fully understandable to the team".
I said: "Ok, where's the documentation?"
"There isn't any."
And there it sat, my very own Moby-Dick of a programme.
I worked on it for months, trying to disentangle something that was essentially spaghetti-code written over years by several different programmers, with no comments or documentation.
I think I eventually reduced the 15" printout to about 12". But, essentially, it defeated me and swam off back into the mainframe aether largely oblivious to my efforts. At least it still worked.
It's the only computer programme I can remember the name of, even 30 years later.