KQED: Trapping Millions of 'Zombie' Urchins Could Restore California's Once Mighty Kelp Forests

Grant Downie is cruising through Caspar Bay, a small cove 150 miles north of San Francisco on the rugged Mendocino County coast. From the helm of his 18-foot fishing boat, The Rose, Downie steers along the jagged cliffs that surround a pristine beach at the shore.

The sea in this protected inlet appears peaceful and calm. But below the surface, all is not well.