KNBC-TV reports that $1 million worth of marijuana and $22 million worth of cocaine was seized when authorities discovered the tunnel under a house in the San Diego County town of Calexico in 2016.
The station says the tunnel had ventilation, electricity and an elevator that could fit up to 10 people.
Officials say it was the first time drug traffickers had built a house for the purpose of concealing a drug tunnel.
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