Hundreds of lifeguards have been demonstrating both in, and along the shoreline of, Victoria Harbour as part of a one-day strike over pay and conditions.
Their action led to the closure of at least nine pools, and there are no lifesavers at many of Hong Kong's beaches.
More than 100 lifeguards swam along the Tsim Sha Tsui coastline, and more than 300 marched along the tourist hotspot, the Avenue of Stars.
The lifeguards are unhappy with manpower levels. They also feel underpaid and that the government doesn't treat them as professionals.
Many frequently leave the job to join the disciplined services.
The Leisure and Cultural Services Department has expressed regret over the strike, and it apologised to swimmers. It said it'll continue its talks with unions to seek a consensus.