Flash flooding across the Las Vegas Valley over the weekend led to multiple water rescues and the death of a person believed to have been living in an underground tunnel, renewing concerns about how to protect people sheltering in flood-prone areas. Las Vegas Metropolitan Police Department officers were called at about 1:11 p.m. Sunday to the 3500 block of South Las Vegas Boulevard, where they found a person unresponsive. The person was pronounced dead at the scene. Police have not released the person’s identity or official cause of death. The flooding is believed to have contributed to the death. Outreach workers say warning people in tunnels and washes can be difficult. Robert Banghart, vice president of community and governmental affairs for the Shine a Light Foundation, estimates that 1,200 to 1,500 people may live across roughly 600 miles of tunnels and washes in the valley. The underground spaces can be difficult to navigate, Banghart said, with some tunnels branching in several directions and varying in size. Outreach groups distribute flyers and share severe-weather information, but he said there is no comprehensive system to ensure everyone receives warnings. Some people are reluctant to leave when storms approach because they regard the tunnels as home, Banghart said. He described the shelter as offering an illusion of safety, while noting how difficult it is to be homeless. Staying underground during a flood can also put first responders in danger when they attempt rescues. Emergency crews handled several other water-related incidents during the storms. Clark County firefighters rescued two people swept into a flood-control channel near Las Vegas Boulevard and Silverado Ranch Boulevard. Las Vegas Fire & Rescue responded to nine separate swift-water rescue incidents; eight involved vehicles trapped in floodwaters. Banghart said the death is especially painful because people experiencing homelessness have families and loved ones. He urged the community to remember that those who die in such circumstances are people with parents, siblings, children and other connections. The weekend’s rescues highlight the challenge of reaching people in the valley’s tunnels and washes before floodwaters rise. Outreach workers say reliable ways to deliver urgent weather warnings remain essential to preventing further deaths.