Robot bees have been around for a while. Researchers are coming up with new sophisticated versions all the time. Harvard researchers have come up with a hybrid RoboBee that can fly, dive, swim, and explode out of water. It has 4 buoyant and a central gas collection chamber. An electrolytic plate in the chamber converts water into oxyhydrogen.
The robot is very light, making it ideal for environmental monitoring and biological studies. Harvard will explore commercialization opportunities of this idea in the future.