Screenshot from the YouTube channel E2Rlab
The drone shown in this video can not only fly in the air, but also (swim?) underwater!
Video of the Loon Copter for the 2016 Drones for Good Competition. The Loon Copter was selected as 1 of 10 semifinalist in the international category. The competition had received 1017 entries from 165 countries. E2Rlab on YouTube