Swimmer Harold Elven wears trunks and a harness across his back which is attached to a fishing line. Professional fisherman Jack Hargreaves attaches the line to his rod and attempts to reel Harold in, competing with his fishing skills against Harold’s athletic strength as Harold tries to reach the end of the pool.
Back in the immediate, austere post-WW2 days when fishing was a pretty ‘jolly’ , harmless, pipe-smoking chaps affair deemed fit to be shown to pre-television movie-goers in the weekly Pathe News ‘short’ before the screening of the main feature. The man with the make-it-snappy rod and what, to me, looks like an old Hardy Sea Silex reel (or very similar) went on to appear on British television and delighted many a country-loving and totally fish-struck kid like me (and many a casual onlooker ‘townie’) during the 1960s and ’70s. Very good at it he was, too. Here is old Jack, still much-remembered by people of a ‘certain age’ –
https://en.wikipedia.org/wiki/Jack_Hargreaves