The 30-year-old adventurous star has spent a week time in Puerto Rico, where her fiance Justin Timberlake has been filming his new movie "Runner, Runner", to learn the diving with the help of instructors from the Professional Association of Diving Instructors (PADI), reported Daily Star.
"I know I've been MIA (missing in action), but I just completed my advanced diving course with PADI!," she wrote on Twitter.
Biel can now perform solo scuba dives at her leisure.
