Two scientists have broken the record for the longest time spent living underwater, as of 11:28 a.m. EST today.

The biologists, Bruce Cantrell and Jessica Fain, have spent nearly 10 weeks in Jules’ Undersea Lodge, which bills itself as “the only undersea hotel on Earth” and is located just off the coast of Key Largo, Florida.

Prior to this morning, the record was held by Richard Presley, who spent 69 days and 19 minutes in the same “hotel” in 1992, according to Guinness World Records. Presley participated in a NASA experiment to simulate the isolation of living in space and surfaced once his mission was over.

Cantrell and Fain, respectively a biology professor and biology instructor at Roane State Community College in Harriman Tennessee, decided to live underwater to learn more about marine biology and educate students about the ocean. They’ve hosted a series of weekly educational videos, all available on YouTube, about their time living underwater, which they’ve dubbed Classroom Under the Sea.

The videos are aimed at teachers and students from middle school and older. The trip was funded by the college and other groups, and its official sponsor isDiversity in Aquatics, an organization devoted to “decreasing the rate of drowning deaths worldwide” and teaching people about water safety.

The duo recounted their experience in a final video aired today (below, fast-forward to 11:10). Highlights included meeting Buzz Aldrin and other scientists, all of whom came to visit them in their undersea abode and participate in their YouTube videos.