article_snippet.sent: But firefighters have warned those thinking about stripping off and diving into the water - with more than 650 water-related deaths in the UK in 2013.
article_snippet.sent: The act, known as ‘tombstoning’, can lead to people suffering ‘cold water shock’ when the air temperature is much higher than that of the water.
article_snippet.sent: But it’s important to realise that open water has hidden dangers that can hurt you and at worse, kill you.
article_snippet.sent: On the first-ever Drowning Prevention and Water Safety Week, firefighters added that the 16-30 age group was worst-hit by water deaths in 2013.
highlights_snippet.sent: coast and firefighters issue 'tombstoning' warning .