Authorities in California have arrested a man following the discovery of a covert underground bunker brimming with a concerning array of illegal firearms and ammunition. This startling find has led to a series of weapons-related charges against Michael Kamfolt, a 40-year-old resident of Anderson.

Kamfolt’s arrest by the California Highway Patrol (CHP) marked the culmination of an investigation targeting an alleged illicit marijuana cultivation site on his Anderson property. Among the charges he faces are possession of an assault rifle and the manufacturing of a ghost gun, reflecting the severity of the accusations.

The operation at Kamfolt’s property revealed more than just an illegal grow. CHP Northern Division Chief John Pinoli emphasized the broader implications, stating, “This operation extended far beyond an illegal marijuana cultivation. The hidden bunker and its alarming cache of illegal firearms and ammunition pose a significant threat to public safety.”

On January 20, law enforcement conducted a property search, which led to the astonishing discovery of an underground bunker. This concealed space was accessible through a 100-foot-long culvert, illustrating the lengths taken to conceal its existence.

The interior of the bunker was equipped with power, a ventilation system, a concrete floor complete with built-in drainage, and all the necessary supplies for marijuana cultivation, as detailed in a statement from the CHP.

“The bunker was equipped with power, ventilation, a concrete floor with built-in drainage and the necessary supplies to cultivate marijuana,” CHP said in a statement. 

“In addition to the bunker, officers seized 13 firearms, four soft body armor vests, 30 high-capacity magazines, and approximately 10,000 rounds of ammunition, including armor-piercing rounds,” it added. “Among the seized firearms were a sawed-off shotgun, three AR-15 style assault rifles, one with an obliterated serial number, and two firearms reported stolen in 2016 and 1978, respectively.” 

The California Highway Patrol said a massive weapons cache was found inside the bunker, shown at left. (CHP)

CHP also said it received a tip about the property in December 2025 before returning this month with a search warrant, which “led to an illicit cannabis cultivation operation and underground bunker.” 

The CHP’s announcement drew plenty of reactions from commenters on Facebook, with one saying in response to the post, “Bros got an absolute dream prep setup.” 

A 100-foot tunnel led to the bunker in Anderson, the California Highway Patrol said. (CHP)

“Dude was just preparing for the apocalypse,” said another.