A sophisticated 2,000‑foot (610-meter) drug tunnel linking Mexicoand California has been uncovered by US authorities, leading to the seizure of $45 million (€38.8 million) worth of cocaineand four arrests.

Equipped with electricity, ventilation and a rail system, the tunnel connected to a warehouse near San Diego. Officials called it a major blow to cartel operations.

Experts say such tunnels can move large volumes undetected, though single seizures have limited impact on the broader drug trade. 

DW discussed this with Sanho Tree, Director of the Drug Policy Project at the Institute for Policy Studies in Washington, D.C.