The San Ysidro Port of Entry in California has resulted in a shocking discovery that led to the discovery of a person hidden inside a gas tank compartment. The person was found hidden inside the gas tank, a place designed for fuel, fumes, and not for human passengers. The incident occurred during a routine inspection at one of the busiest land border crossings on the planet. The vehicle was identified as a 2005 GMC SUV driven by a 20-year-old, driven by either the Envoy (mid-size SUV) or Yukon (full-sized SUV), or the Yukon XL. The driver is expected to face serious human smuggling charges. Both the hidden passenger and the driver were taken into custody. The ingenuity involved in modifying a fuel system to create a human-sized cavity is both technically fascinating and deeply troubling.