Parliament Hill Lido in Hampstead, north London, issued the warning on its Facebook page after lifeguards noticed a rise in cases.
Cold water swimming has increased in popularity amid reports about its numerous health benefits. But it can be dangerous for inexperienced swimmers.
A member of the Parliament Hill Lido User Group asked swimmers to avoid spending too long in the water in light of the recent hypothermia cases. Swimmers were also warned not to use the saunas to warm up if they got into trouble.
The lido told the BBC that although none of the cases was serious enough to require hospital treatment, the lifeguards were taken away from their other duties, putting swimmers at risk.
Emma Rea, co-chair of the Parliament Hill User Group, advised new swimmers to consider the temperature before entering the pool, and not to go in if they had been drinking or had not slept enough the night before.
A spokesperson for the Hampstead Heath charity reminded visitors that “there are risks associated with cold water swimming, even for regular winter swimmers, We are advising people to swim with care and only spend a short amount of time in the water.”
As well as rescuing the ill-prepared from land and sea, it seems that the emergency responders now have to react to similar scenarios in swimming-pools …
Coincidentally, “The Ponds” is currently on NetFlix: