Airship fish (Airfish?) good for events and spying

This video from the New Scientist shows a new type of airship that’s modelled on fish. I keep on wanting to call it an airfish.

You see; it navigates by wriggling like a fish. This means it can do without the standard propulsion methods used by other airships and without them it is almost silent.

What can you use an almost silent airship for? It’s great for hovering above people to take videos or pictures. You could use it, for example, to watch the crowd during a festival or concert.