While diving in San Carlos, there were sea lions in the water. One came up to my buddy and I and lunged towards me. Well he struck me then swam away but I didn’t see anything wrong or did not feel like I got bit. So we continued our dive and when we surfaced, people on the boat were laughing. All of a sudden I heard a whistle being blown and turned aroud to see on of the sea lions blowing on an orange whistle. I get to the boat and realize that the whistle was mine and that is what he took from my BC when he lunged.