People swimming in UK rivers and lakes to beat soaring temperatures now face serious health risks. Sewage spills have turned the water unsafe . Some children in Wales suffered severe reactions after their latest swim. Illness included violent sickness and stomach cramps Officials say dirty water is a real and growing danger. Environmental agencies stress the hidden threats. A deadly gator strike shocked local residents A woman swimming in a state forest river was killed by an alligator. Such incidents remain rare but are rising. Both stories show open waters can turn deadly fast .
High temperatures do not guarantee safety Swimming holes can hide invisible hazards . Natural habitats can shift from welcoming to deadly in an instant .