WASHINGTON, July 7 - A brave diver who spotted a 15-foot hammerhead shark decided to chase the predator for a better view. The video, posted to YouTube by David McNabb, shows the 15-foot shark swimming past the cameraman toward murkier waters. The cameraman's wife, identified only as Kristy, then appears in frame and swims after the shark. The filmer follows Kristy until they lose sight of the hammerhead. The dive master is seen giving an amused look to the camera after watching the couple chase after the shark.