Tina Watson was 26 and on her honeymoon when she died during a scuba dive on the Great Barrier Reef on October 22, 2003. The couple were exploring the SS Yongala wreck when Tina, described as an inexperienced diver, became unconscious within minutes and sank to the ocean floor at a depth of 98 feet.

Her husband, David Gabriel Gabe Watson, an experienced diver, said strong currents separated them and that Tina panicked, knocking off his mask and regulator; he said he surfaced to get help when she sank. Investigators noted his account changed several times and that his dive computer showed movements that contradicted his statements. A coroner found it likely Watson had killed his wife by cutting off her air and holding her underwater.

Watson was later charged and pleaded to a lesser count related to failure to rescue and served time in Australia before being deported to the United States; Alabama prosecutors later pursued homicide charges but a judge dismissed that case for lack of evidence before the defense presented its case. Did anyone on the reef that day or anyone who knew Tina or Gabe notice anything unusual about their diving plans or experience?