Mexican open-water swimmer David Olvera has completed a swim around Manhattan Island in 5 hours, 34 minutes and 58 seconds — an unofficial world record that would surpass the previous mark by nearly seven minutes.

Olvera, 31, from Ciudad Valles, San Luis Potosí, finished the 48.5-kilometer (30.1-mile) course Thursday morning, according to New York Open Water, a nonprofit that provides safety, support and funding for open-water swimming and kayaking events and competitions.

“Huge congratulations to David Olvera