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Nairobi County converted disused utility tunnels beneath Industrial Area into the Nairobi Underground Parkour Circuit on October 5, 2025—safe, lit, and monitored spaces for youth training, with foam pits and grip walls. The city hides arenas—we just uncover them, said coach Zawadi Mwaura. 400 youth train weekly; crime in the zone dropped 52%. Safaricom sponsors lighting and coaching. The circuit includes history murals on Nairobi’s infrastructure. Plans for 5 more tunnels by 2026 are underway.