First bird-scale robot to swim, dive, and launch back into flight

A robot that swims like a diving bird and then flies like, well, a bird, sounds like the setup for two different machines bolted together. But researchers at MIT and EPFL built one that does both with a single set of wings. No propellers, no legs, and no origami-style folding mechanism to switch mode

https://newatlas.com/robotics/first-bird-robot-swim-dive-launch-mit-epfl/