"Helped" by the light, we can see that under the water there still are the largest marine mammals in the world. But as said, they're visible only with the help of the light, so very hard to see. That means that by going in the direction we've taken not too many years ago, in the future they will disappear, so that wants to represents that we have to change our habits in order to avoid in the best way that we can the unuseful waste of material and a more eco-friendly way of thinking.