Diving the Lost Lighthouse of Alexandria.

Everyone told Robert it was impossible — which only made him more determined. Months of research and planning led to a rare descent beneath Alexandria Harbor, through difficult conditions and the remnants of earthquakes that buried one of the Seven Wonders of the Ancient World almost 2,000 years ago.

After improvising his equipment and passing a dive test few can, he entered a place most explorers will never see: history preserved beneath the sea.