Stunned by widespread ignorance about the Gulf of Mexico following the 2010 Macondo oil spill, underwater photographer Jesse Cancelmo decided to turn his camera on the marine life of this 600,000 square mile international sea that connects five US states, six Mexican states, and the island nation of Cuba. With the goal of countering dismissive descriptions of a Gulf plagued with dead zones and overrun by oil rigs, Cancelmo set out to capture a world...