CNN  —  The future of Alcatraz lies in one man’s hands. In 2023, as sea levels rose around the iconic island in San Francisco Bay, Pete Kelsey — a technologist specializing in 3D data capture — was called in to help save the site for future generations. By mapping the entire island, as he was tasked to do, Alcatraz could be monitored in detail going forward — and future proofed. Preserving one of the world’s most famous islands is no minor task. In December 2023, as Kelsey made his first trip