Narwhal released after tagging (VIDEO) University of California - Santa Cruz This video is under embargo. Please login to access this video. Caption This video shows the first dive of an adult narwhal after tagging. The research team can be seen standing in the water as the narwhal swims off, and then rolls onto its back exposing his white belly. The yellow heart rate tag is clearly visible on his back as the animal first swims. Credit Video credit: C. Egevang. Usage Restrictions For use only with news coverage of this research License Original 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.