Anyone who sees someone in an emergency in the water should call 999, stay out of the water themselves and throw them something that floats, such as a plastic water bottle or football, for them to hold onto and stay afloat while help is on the way, the RLSS added.
Source: https://www.bbc.com/news/articles/clyppw0q54no?at_medium=RSS&at_campaign=rss