A WARNING about the dangers of swimming in reservoirs and open water in hot weather has been launched at a beauty spot notorious for drowning tragedies.

Children watched as police and firefighters staged a mock rescue at Ward's reservoir in Belmont, near Bolton - known as the Blue Lagoon.

The reservoir's beauty masks cold water temperatures and hidden dangers under the surface.

Nicky Wetton, 17, from Coppull, near Chorley, drowned there in 2004 while swimming with friends. Described as a `star' by his family, his father Darren said Nicky's last words to him were: `I'll be okay' after he was warned of the dangers.

Nicky's friends raised the alarm when he vanished under the water. His body was recovered an hour later.

Four years earlier David McHugh, 33, from Salford, drowned while trying to save his seven-year-old son Daniel when their rubber dinghy sank.

Children from Belmont Primary School looked on from the water side as the emergency services staged a dramatic rescue event.

Police then briefed the children about staying safe in summer.

Sgt Jon Cisco said alcohol, sun and swimming in open waters was a potentially fatal combination.

He said: "It is vital that we do everything possible to raise awareness of the dangers associated with swimming in open water, particularly during the summer months and I hope this campaign serves as a reminder to everyone.

"Local reservoirs can appear very inviting, particularly when the weather is hot, but the reality is very different and entering into this water could have tragic consequences.

"I urge everyone to act sensibly and stay safe, particularly if drinking alcohol beside local streams or reservoirs. Our advice is to avoid swimming when under the influence of alcohol as it can reduce the body temperature and cause cramps.

"Parents were also advised to educate their children and remain vigilant while they are playing near pools or ponds."

Outdoor water temperatures in Britain are barely one degree above freezing and many reservoirs feature perilous cliff edges.

Sgt Cisco added: "I urge people to be extremely cautious if they see someone in difficulty. The best advice is to dial 999 immediately.

"We want people to enjoy themselves this summer but the message is simple, stay safe. Every year, children across the country die as a result of swimming in unauthorised areas."

The Blue Lagoon reservoir is owned by the Belmont Bleaching and Dying Company but cannot be fenced off due to a public footpath around its perimeter.