This week we're replaying some of our favorite undersea episodes. In this one from June 2021, the story of the robotic fish called Charlie and Charlene, and how they were developed by the Central Intelligence Agency. Plus: one place you might mark National Surfing Day is the Santa Cruz Surfing Museum in California.
Meet Catfish Charlie, the CIA’s Robotic Spy (IEEE Spectrum)
Santa Cruz Surfing Museum (Atlas Obscura)
