WATCH: Inside look at the dangerous cartel human smuggling tunnels still being used at border

Cartels continue using storm drain tunnels in El Paso to smuggle humans and narcotics despite increased border security. U.S. Customs and Border Protection's Confined Space Entry Team faces challenges like heat and low oxygen while patrolling the tunnels, which now see smaller groups of migrants due to stricter enforcement. Smugglers charge $20,000 to $30,000 per person and use social media to recruit guides for the hazardous routes.