They probably have considerable footage of tapes considering the time line. Also a full gamut of anxiety and panic, from ~thought I ought to report it~ to ~screaming and crying~.
Training an operator with different types of calls, for a situation that they are familiar with (who isn't by now), will teach them;
Not to underestimate the importance of any call,
To understand what people are trying to convey,
To decode panicky calls,
etc, etc, etc.
Again, I think the main value is all the calls are linked to a known event.
