In case you aren't familiar with the film, here's the description from IMDb:
In a futuristic city sharply divided between the working class and the city planners, the son of the city's mastermind falls in love with a working class prophet who predicts the coming of a savior to mediate their differences.
And here are some stills from the film:
During this particular scene the adults have forgotten their children, dooming them to drown. I couldn't help but make a wisecrack that nowadays, we'd tell this story from the perspective of the kids about how dumb/clueless their parents are.
As you can see Metropolis has machines and working drudges, robots and skyscrapers; it's truly a classic dystopian sci-fi film, and if you haven't seen it, you should. It's one of the most influential films of this genre and the cinematography is stunning (and bonus: it's on Netflix!)