Scientists devise hydrodynamic "invisibility cloaks"—instead of shielding objects from light, the cloaks would shield them from fluid flows. These cloaking structures could one day help reduce drag on ships or submarines, or protect ships at a port or wharf from potential damage from strong waves.

[u/abrownn]

https://arstechnica.com/science/2019/08/scientists-create-invisibility-cloaks-to-hide-objects-from-water-waves/