Advanced Diving Technology (IMAGE) PeerJ Caption Rebreather diver and lead author Richard Pyle uses an advanced closed-circuit rebreather in conjunction with the Hawai'i Undersea Research Laboratory's Pisces V submersible to explore deep coral reefs off Hawaii. Credit Robert K. Whitton. License: CC-BY Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.