Prince William has recorded a video message outlining importance of teaching children to swim.
It follows a report by the Amateur Swimming Association (ASA) which shows more than half of children aged 7-11 years cannot swim 25 metres unaided.
"Swimming has always been important to me," the Duke of Cambridge said. "Swimming is unique, it is the only sport that can save lives, which is why I'm so keen for school swimming to be accessible for all children at all primary schools."
He added: "The ability to swim changes lives, it brings huge joy and it can keep us fit and healthy. But above all, it can keep us safe, which is why I'm pleased to lend my support to this campaign."
More top news
A report into the care of people with learning disabilities has called for "immediate action" to protect patients.
A high number of people are fed-up with getting cold calls and want the government to do more to stop them.
The number of violent homophobic crimes have increased in the UK this year, according to new figures.