Scuba divers ask lots of questions, including "Why do I surface with blood in my mask?" and "Is it OK to exercise after a dive?" Here are the answers to 10 of the most frequently asked ones.

When is safe to fly after scuba diving? How long should you wait after diving to fly — 12 hours? 24 hours? The answer may surprise you.

Get to know underwater photographer Nicholas Samaras, who took first place for Macro in *Scuba Diving's* 2019 Photo Contest.

Get to know underwater photographer Gabriel Barathieu, who took first place for Wide-Angle in *Scuba Diving's* 2019 Photo Contest.

Limpus has spent 50 years dedicated to sea turtle conservation in Queensland, Australia.

Get to know underwater photographer Florent Gooden, who took first place for Behavior in Scuba Diving's 2019 Photo Contest.

Get to know underwater photographer Jack Israel, who took the Grand Prize in Scuba Diving's 2019 Photo Contest.

Blue Planet II executive producer James Honeyborne brought serious conservation issues to light with the BBC series and introduced the underwater world to millions with never-before-seen footage.

Monterey Bay Aquarium Volunteer Marv Tuttle was honored as a Sea Hero by Scuba Diving magazine and Seiko watches for his work introducing scuba diving to children with disabilities.