A 68-year-old grandfather tragically died after suffering a cardiac arrest while trying to rescue two relatives from the sea at Tregirls Beach near Padstow, Cornwall. The local builder entered the water to save his struggling family members, who were subsequently rescued by bystanders. This incident occurred during a bank holiday weekend that saw record temperatures in the UK, with highs of 35.1C recorded in London. Unfortunately, the weekend was marred by tragedy, as five teenagers also lost their lives in separate water-related incidents across the country. Among them was Reco Puttock, a 13-year-old who died after being pulled from Leadbeater Dam in West Yorkshire, and a 16-year-old girl found in a Warwickshire lake. Authorities have emphasized the dangers of swimming in open water, urging the public to choose lifeguarded locations and supervise children closely. Experts from the Royal Life Saving Society UK have highlighted the hidden hazards in open water, including strong currents and cold temperatures, which can pose serious risks to swimmers. They advise against entering the water to rescue someone in trouble, recommending that people call emergency services instead.