What Is That Massive Tunnel on the Beach South of Fort Funston?

On a Daly City beach just south of Fort Funston there's a large tunnel carved into the cliff. Bay Curious listener Francisco Alvarado noticed it one day while walking his chihuahua, Little Bean, down the beach. The tunnel is large enough for a person to stand up and several feet wide, so of course Francisco's mind started racing. What could this mysterious tunnel be? Is it a remnant of life long ago? Or could it be something as mundane as a drain outlet? We head to Phillip Burton Memorial Beach, as it's technically called, with a geologist to find some answers. Additional Reading What Is That Massive Tunnel on the Beach South of Fort Funston? Read the transcript for this episode Sign up for our newsletter Enter our Sierra Nevada Brewing Company monthly trivia contest Got a question you want answered? Ask! Your support makes KQED podcasts possible. You can show your love by going to https://kqed.org/donate/podcasts This story was reported by Katrina Schwartz. Bay Curious is made by Katrina Schwartz, Gabriela Glueck and Christopher Beale. Additional support from Olivia Allen-Price, Jen Chien, Katie Sprenger, Maha Sanad, Alana Walker, Holly Kernan and everyone on Team KQED.