Emily Callahan was working at the Deepwater Horizon oil spill in 2010 when she noticed something strange. The workers said they couldn’t wait to get back to fishing near oil rigs. She thought they were crazy until they told her, “That’s where the fish are.” That experience started her down the path of promoting a program that lets companies turn old oil rigs into artificial reefs that support a surprising array of sea life. Emily Callahan and Amber Jackson met as graduate students at the Scripps