Drown (2015) on Netflix

Plot summary

At his surf lifesaving club, Len is the champion and a legend in that closed world, just like his father. Phil turns up younger, faster and fitter than Len, and Len's legendary standing there starts to crumble. Then Len sees Phil in the company of another man, and Phil is gay. Three surf lifesavers from the club set out together for a big night out.